Merge pull request #10137 from thingsboard/feature/snmp-request-delay

SNMP: delay between sending request chunks; traps processing fixes

application/src/main/resources/thingsboard.yml

@@ -1173,14 +1173,18 @@ transport:
     bind_port: "${SNMP_BIND_PORT:1620}"
     response_processing:
       # parallelism level for executor (workStealingPool) that is responsible for handling responses from SNMP devices
-      parallelism_level: "${SNMP_RESPONSE_PROCESSING_PARALLELISM_LEVEL:20}"
+      parallelism_level: "${SNMP_RESPONSE_PROCESSING_PARALLELISM_LEVEL:4}"
     # to configure SNMP to work over UDP or TCP
     underlying_protocol: "${SNMP_UNDERLYING_PROTOCOL:udp}"
-    # Batch size to request OID mappings from the device (useful when the device profile has multiple hundreds of OID mappings)
+    # Maximum size of a PDU (amount of OID mappings in a single SNMP request). The request will be split into multiple PDUs if mappings amount exceeds this number
     max_request_oids: "${SNMP_MAX_REQUEST_OIDS:100}"
+    # Delay after sending each request chunk (in case the request was split into multiple PDUs due to max_request_oids)
+    request_chunk_delay_ms: "${SNMP_REQUEST_CHUNK_DELAY_MS:100}"
     response:
       # To ignore SNMP response values that do not match the data type of the configured OID mapping (by default false - will throw an error if any value of the response not match configured data types)
       ignore_type_cast_errors: "${SNMP_RESPONSE_IGNORE_TYPE_CAST_ERRORS:false}"
+    # Thread pool size for scheduler that executes device querying tasks
+    scheduler_thread_pool_size: "${SNMP_SCHEDULER_THREAD_POOL_SIZE:4}"
   stats:
     # Enable/Disable the collection of transport statistics
     enabled: "${TB_TRANSPORT_STATS_ENABLED:true}"

common/transport/snmp/src/main/java/org/thingsboard/server/transport/snmp/SnmpTransportContext.java

@@ -152,12 +152,14 @@ public class SnmpTransportContext extends TransportContext {
         try {
             if (!newProfileTransportConfiguration.equals(sessionContext.getProfileTransportConfiguration())) {
                 sessionContext.setProfileTransportConfiguration(newProfileTransportConfiguration);
+                sessionContext.setDevice(device);
                 sessionContext.initializeTarget(newProfileTransportConfiguration, newDeviceTransportConfiguration);
                 snmpTransportService.cancelQueryingTasks(sessionContext);
                 snmpTransportService.createQueryingTasks(sessionContext);
                 transportService.lifecycleEvent(sessionContext.getTenantId(), sessionContext.getDeviceId(), ComponentLifecycleEvent.UPDATED, true, null);
             } else if (!newDeviceTransportConfiguration.equals(sessionContext.getDeviceTransportConfiguration())) {
                 sessionContext.setDeviceTransportConfiguration(newDeviceTransportConfiguration);
+                sessionContext.setDevice(device);
                 sessionContext.initializeTarget(newProfileTransportConfiguration, newDeviceTransportConfiguration);
                 transportService.lifecycleEvent(sessionContext.getTenantId(), sessionContext.getDeviceId(), ComponentLifecycleEvent.UPDATED, true, null);
             } else {

common/transport/snmp/src/main/java/org/thingsboard/server/transport/snmp/service/SnmpTransportService.java

@@ -15,6 +15,11 @@
  */
 package org.thingsboard.server.transport.snmp.service;
 
+import com.google.common.util.concurrent.Futures;
+import com.google.common.util.concurrent.ListenableFuture;
+import com.google.common.util.concurrent.ListenableScheduledFuture;
+import com.google.common.util.concurrent.ListeningScheduledExecutorService;
+import com.google.common.util.concurrent.MoreExecutors;
 import com.google.gson.JsonElement;
 import com.google.gson.JsonObject;
 import lombok.Builder;
@@ -32,7 +37,7 @@ import org.snmp4j.mp.MPv3;
 import org.snmp4j.security.SecurityModels;
 import org.snmp4j.security.SecurityProtocols;
 import org.snmp4j.security.USM;
-import org.snmp4j.smi.Address;
+import org.snmp4j.smi.IpAddress;
 import org.snmp4j.smi.OctetString;
 import org.snmp4j.smi.TcpAddress;
 import org.snmp4j.smi.UdpAddress;
@@ -44,6 +49,7 @@ import org.springframework.context.annotation.Lazy;
 import org.springframework.stereotype.Service;
 import org.thingsboard.common.util.ThingsBoardExecutors;
 import org.thingsboard.common.util.ThingsBoardThreadFactory;
+import org.thingsboard.server.common.adaptor.JsonConverter;
 import org.thingsboard.server.common.data.DataConstants;
 import org.thingsboard.server.common.data.TbTransportService;
 import org.thingsboard.server.common.data.kv.DataType;
@@ -53,11 +59,11 @@ import org.thingsboard.server.common.data.transport.snmp.SnmpMethod;
 import org.thingsboard.server.common.data.transport.snmp.config.RepeatingQueryingSnmpCommunicationConfig;
 import org.thingsboard.server.common.data.transport.snmp.config.SnmpCommunicationConfig;
 import org.thingsboard.server.common.transport.TransportService;
-import org.thingsboard.server.common.adaptor.JsonConverter;
 import org.thingsboard.server.gen.transport.TransportProtos;
 import org.thingsboard.server.queue.util.TbSnmpTransportComponent;
 import org.thingsboard.server.transport.snmp.SnmpTransportContext;
 import org.thingsboard.server.transport.snmp.session.DeviceSessionContext;
+import org.thingsboard.server.transport.snmp.session.ScheduledTask;
 
 import javax.annotation.PostConstruct;
 import javax.annotation.PreDestroy;
@@ -71,8 +77,6 @@ import java.util.Map;
 import java.util.Optional;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
-import java.util.concurrent.ScheduledExecutorService;
-import java.util.concurrent.ScheduledFuture;
 import java.util.concurrent.TimeUnit;
 import java.util.stream.Collectors;
 
@@ -80,6 +84,7 @@ import java.util.stream.Collectors;
 @Service
 @Slf4j
 @RequiredArgsConstructor
+@SuppressWarnings("UnstableApiUsage")
 public class SnmpTransportService implements TbTransportService, CommandResponder {
     private final TransportService transportService;
     private final PduService pduService;
@@ -88,23 +93,27 @@ public class SnmpTransportService implements TbTransportService, CommandResponde
 
     @Getter
     private Snmp snmp;
-    private ScheduledExecutorService queryingExecutor;
+    private ListeningScheduledExecutorService scheduler;
-    private ExecutorService responseProcessingExecutor;
+    private ExecutorService executor;
 
     private final Map<SnmpCommunicationSpec, ResponseDataMapper> responseDataMappers = new EnumMap<>(SnmpCommunicationSpec.class);
     private final Map<SnmpCommunicationSpec, ResponseProcessor> responseProcessors = new EnumMap<>(SnmpCommunicationSpec.class);
 
     @Value("${transport.snmp.bind_port:1620}")
     private Integer snmpBindPort;
-    @Value("${transport.snmp.response_processing.parallelism_level}")
+    @Value("${transport.snmp.response_processing.parallelism_level:4}")
-    private Integer responseProcessingParallelismLevel;
+    private int responseProcessingThreadPoolSize;
+    @Value("${transport.snmp.scheduler_thread_pool_size:4}")
+    private int schedulerThreadPoolSize;
     @Value("${transport.snmp.underlying_protocol}")
     private String snmpUnderlyingProtocol;
+    @Value("${transport.snmp.request_chunk_delay_ms:100}")
+    private int requestChunkDelayMs;
 
     @PostConstruct
     private void init() throws IOException {
-        queryingExecutor = Executors.newScheduledThreadPool(Runtime.getRuntime().availableProcessors(), ThingsBoardThreadFactory.forName("snmp-querying"));
+        scheduler = MoreExecutors.listeningDecorator(Executors.newScheduledThreadPool(schedulerThreadPoolSize, ThingsBoardThreadFactory.forName("snmp-querying")));
-        responseProcessingExecutor = ThingsBoardExecutors.newWorkStealingPool(responseProcessingParallelismLevel, "snmp-response-processing");
+        executor = ThingsBoardExecutors.newWorkStealingPool(responseProcessingThreadPoolSize, "snmp-response-processing");
 
         initializeSnmp();
         configureResponseDataMappers();
@@ -115,11 +124,11 @@ public class SnmpTransportService implements TbTransportService, CommandResponde
 
     @PreDestroy
     public void stop() {
-        if (queryingExecutor != null) {
+        if (scheduler != null) {
-            queryingExecutor.shutdownNow();
+            scheduler.shutdownNow();
         }
-        if (responseProcessingExecutor != null) {
+        if (executor != null) {
-            responseProcessingExecutor.shutdownNow();
+            executor.shutdownNow();
         }
     }
 
@@ -144,38 +153,39 @@ public class SnmpTransportService implements TbTransportService, CommandResponde
     }
 
     public void createQueryingTasks(DeviceSessionContext sessionContext) {
-        List<ScheduledFuture<?>> queryingTasks = sessionContext.getProfileTransportConfiguration().getCommunicationConfigs().stream()
+        sessionContext.getProfileTransportConfiguration().getCommunicationConfigs().stream()
                 .filter(communicationConfig -> communicationConfig instanceof RepeatingQueryingSnmpCommunicationConfig)
-                .map(config -> {
+                .forEach(config -> {
                     RepeatingQueryingSnmpCommunicationConfig repeatingCommunicationConfig = (RepeatingQueryingSnmpCommunicationConfig) config;
                     Long queryingFrequency = repeatingCommunicationConfig.getQueryingFrequencyMs();
 
-                    return queryingExecutor.scheduleWithFixedDelay(() -> {
+                    ScheduledTask scheduledTask = new ScheduledTask();
+                    scheduledTask.init(() -> {
                         try {
                             if (sessionContext.isActive()) {
-                                sendRequest(sessionContext, repeatingCommunicationConfig);
+                                return sendRequest(sessionContext, repeatingCommunicationConfig);
                             }
                         } catch (Exception e) {
                             log.error("Failed to send SNMP request for device {}: {}", sessionContext.getDeviceId(), e.toString());
                             transportService.errorEvent(sessionContext.getTenantId(), sessionContext.getDeviceId(), config.getSpec().getLabel(), e);
                         }
-                    }, queryingFrequency, queryingFrequency, TimeUnit.MILLISECONDS);
+                        return Futures.immediateVoidFuture();
-                })
+                    }, queryingFrequency, scheduler);
-                .collect(Collectors.toList());
+                    sessionContext.getQueryingTasks().add(scheduledTask);
-        sessionContext.getQueryingTasks().addAll(queryingTasks);
+                });
     }
 
     public void cancelQueryingTasks(DeviceSessionContext sessionContext) {
-        sessionContext.getQueryingTasks().forEach(task -> task.cancel(true));
+        sessionContext.getQueryingTasks().forEach(ScheduledTask::cancel);
         sessionContext.getQueryingTasks().clear();
     }
 
 
-    private void sendRequest(DeviceSessionContext sessionContext, SnmpCommunicationConfig communicationConfig) {
+    private ListenableFuture<Void> sendRequest(DeviceSessionContext sessionContext, SnmpCommunicationConfig communicationConfig) {
-        sendRequest(sessionContext, communicationConfig, Collections.emptyMap());
+        return sendRequest(sessionContext, communicationConfig, Collections.emptyMap());
     }
 
-    private void sendRequest(DeviceSessionContext sessionContext, SnmpCommunicationConfig communicationConfig, Map<String, String> values) {
+    private ListenableFuture<Void> sendRequest(DeviceSessionContext sessionContext, SnmpCommunicationConfig communicationConfig, Map<String, String> values) {
         List<PDU> request = pduService.createPdus(sessionContext, communicationConfig, values);
         RequestContext requestContext = RequestContext.builder()
                 .communicationSpec(communicationConfig.getSpec())
@@ -183,18 +193,39 @@ public class SnmpTransportService implements TbTransportService, CommandResponde
                 .responseMappings(communicationConfig.getAllMappings())
                 .requestSize(request.size())
                 .build();
-        sendRequest(sessionContext, request, requestContext);
+        return sendRequest(sessionContext, request, requestContext);
     }
 
-    private void sendRequest(DeviceSessionContext sessionContext, List<PDU> request, RequestContext requestContext) {
+    private ListenableFuture<Void> sendRequest(DeviceSessionContext sessionContext, List<PDU> request, RequestContext requestContext) {
-        for (PDU pdu : request) {
+        if (request.size() <= 1 || requestChunkDelayMs == 0) {
-            log.debug("Executing SNMP request for device {} with {} variable bindings", sessionContext.getDeviceId(), pdu.size());
+            for (PDU pdu : request) {
-            try {
+                sendPdu(pdu, requestContext, sessionContext);
-                snmp.send(pdu, sessionContext.getTarget(), requestContext, sessionContext);
-            } catch (IOException e) {
-                log.error("Failed to send SNMP request to device {}: {}", sessionContext.getDeviceId(), e.toString());
-                transportService.errorEvent(sessionContext.getTenantId(), sessionContext.getDeviceId(), requestContext.getCommunicationSpec().getLabel(), e);
             }
+            return Futures.immediateVoidFuture();
+        }
+
+        List<ListenableFuture<?>> futures = new ArrayList<>();
+        for (int i = 0, delay = 0; i < request.size(); i++, delay += requestChunkDelayMs) {
+            PDU pdu = request.get(i);
+            if (delay == 0) {
+                sendPdu(pdu, requestContext, sessionContext);
+            } else {
+                ListenableScheduledFuture<?> future = scheduler.schedule(() -> {
+                    sendPdu(pdu, requestContext, sessionContext);
+                }, delay, TimeUnit.MILLISECONDS);
+                futures.add(future);
+            }
+        }
+        return Futures.whenAllComplete(futures).call(() -> null, MoreExecutors.directExecutor());
+    }
+
+    private void sendPdu(PDU pdu, RequestContext requestContext, DeviceSessionContext sessionContext) {
+        log.debug("[{}] Sending SNMP request with {} variable bindings to {}", sessionContext.getDeviceId(), pdu.size(), sessionContext.getTarget().getAddress());
+        try {
+            snmp.send(pdu, sessionContext.getTarget(), requestContext, sessionContext);
+        } catch (Exception e) {
+            log.error("[{}] Failed to send SNMP request", sessionContext.getDeviceId(), e);
+            transportService.errorEvent(sessionContext.getTenantId(), sessionContext.getDeviceId(), requestContext.getCommunicationSpec().getLabel(), e);
         }
     }
 
@@ -251,21 +282,19 @@ public class SnmpTransportService implements TbTransportService, CommandResponde
         ((Snmp) event.getSource()).cancel(event.getRequest(), sessionContext);
         RequestContext requestContext = (RequestContext) event.getUserObject();
         if (event.getError() != null) {
-            log.warn("SNMP response error: {}", event.getError().toString());
+            log.warn("[{}] SNMP response error: {}", sessionContext.getDeviceId(), event.getError().toString());
             transportService.errorEvent(sessionContext.getTenantId(), sessionContext.getDeviceId(), requestContext.getCommunicationSpec().getLabel(), new RuntimeException(event.getError()));
             return;
         }
 
         PDU responsePdu = event.getResponse();
-        if (log.isTraceEnabled()) {
+        log.trace("[{}] Received PDU: {}", sessionContext.getDeviceId(), responsePdu);
-            log.trace("Received PDU for device {}: {}", sessionContext.getDeviceId(), responsePdu);
-        }
 
         List<PDU> response;
         if (requestContext.getRequestSize() == 1) {
             if (responsePdu == null) {
-                log.debug("No response from SNMP device {}, requestId: {}", sessionContext.getDeviceId(), event.getRequest().getRequestID());
                 if (requestContext.getMethod() == SnmpMethod.GET) {
+                    log.debug("[{}][{}] Empty response from device", sessionContext.getDeviceId(), event.getRequest().getRequestID());
                     transportService.errorEvent(sessionContext.getTenantId(), sessionContext.getDeviceId(), requestContext.getCommunicationSpec().getLabel(), new RuntimeException("No response from device"));
                 }
                 return;
@@ -281,14 +310,14 @@ public class SnmpTransportService implements TbTransportService, CommandResponde
                         response.add(responsePart);
                     }
                 }
-                log.debug("All response parts are collected for request to device {}", sessionContext.getDeviceId());
+                log.debug("[{}] All {} response parts are collected for request", sessionContext.getDeviceId(), responseParts.size());
             } else {
-                log.trace("Awaiting other response parts for request to device {}", sessionContext.getDeviceId());
+                log.trace("[{}] Awaiting other response parts for request", sessionContext.getDeviceId());
                 return;
             }
         }
 
-        responseProcessingExecutor.execute(() -> {
+        executor.execute(() -> {
             try {
                 processResponse(sessionContext, response, requestContext);
             } catch (Exception e) {
@@ -298,24 +327,31 @@ public class SnmpTransportService implements TbTransportService, CommandResponde
     }
 
     /*
-    * SNMP notifications handler
+     * SNMP notifications handler
-    *
+     *
-    * TODO: add check for host uniqueness when saving device (for backward compatibility - only for the ones using from-device RPC requests)
+     * TODO: add check for host uniqueness when saving device (for backward compatibility - only for the ones using from-device RPC requests)
-    *
+     *
-    * NOTE: SNMP TRAPs support won't work properly when there is more than one SNMP transport,
+     * NOTE: SNMP TRAPs support won't work properly when there is more than one SNMP transport,
-    *  due to load-balancing of requests from devices: session might not be on this instance
+     *  due to load-balancing of requests from devices: session might not be on this instance
-    * */
+     * */
     @Override
     public void processPdu(CommandResponderEvent event) {
-        Address sourceAddress = event.getPeerAddress();
+        IpAddress sourceAddress = (IpAddress) event.getPeerAddress();
-        DeviceSessionContext sessionContext = transportContext.getSessions().stream()
+        List<DeviceSessionContext> sessions = transportContext.getSessions().stream()
-                .filter(session -> session.getTarget().getAddress().equals(sourceAddress))
+                .filter(session -> ((IpAddress) session.getTarget().getAddress()).getInetAddress().equals(sourceAddress.getInetAddress()))
-                .findFirst().orElse(null);
+                .collect(Collectors.toList());
-        if (sessionContext == null) {
+        if (sessions.isEmpty()) {
-            log.warn("SNMP TRAP processing failed: couldn't find device session for address {}", sourceAddress);
+            log.warn("Couldn't find device session for SNMP TRAP for address {}", sourceAddress);
+            return;
+        } else if (sessions.size() > 1) {
+            for (DeviceSessionContext sessionContext : sessions) {
+                transportService.errorEvent(sessionContext.getTenantId(), sessionContext.getDeviceId(), SnmpCommunicationSpec.TO_SERVER_RPC_REQUEST.getLabel(),
+                        new IllegalStateException("Found multiple devices for host " + sourceAddress.getInetAddress().getHostAddress()));
+            }
             return;
         }
 
+        DeviceSessionContext sessionContext = sessions.get(0);
         try {
             processIncomingTrap(sessionContext, event);
         } catch (Throwable e) {
@@ -327,11 +363,11 @@ public class SnmpTransportService implements TbTransportService, CommandResponde
     private void processIncomingTrap(DeviceSessionContext sessionContext, CommandResponderEvent event) {
         PDU pdu = event.getPDU();
         if (pdu == null) {
-            log.warn("Got empty trap from device {}", sessionContext.getDeviceId());
+            log.warn("[{}] Received empty SNMP trap", sessionContext.getDeviceId());
             throw new IllegalArgumentException("Received TRAP with no data");
         }
 
-        log.debug("Processing SNMP trap from device {} (PDU: {}}", sessionContext.getDeviceId(), pdu);
+        log.debug("[{}] Processing SNMP trap: {}", sessionContext.getDeviceId(), pdu);
         SnmpCommunicationConfig communicationConfig = sessionContext.getProfileTransportConfiguration().getCommunicationConfigs().stream()
                 .filter(config -> config.getSpec() == SnmpCommunicationSpec.TO_SERVER_RPC_REQUEST).findFirst()
                 .orElseThrow(() -> new IllegalArgumentException("No config found for to-server RPC requests"));
@@ -341,7 +377,7 @@ public class SnmpTransportService implements TbTransportService, CommandResponde
                 .method(SnmpMethod.TRAP)
                 .build();
 
-        responseProcessingExecutor.execute(() -> {
+        executor.execute(() -> {
             processResponse(sessionContext, List.of(pdu), requestContext);
         });
     }
@@ -352,7 +388,7 @@ public class SnmpTransportService implements TbTransportService, CommandResponde
 
         JsonObject responseData = responseDataMappers.get(requestContext.getCommunicationSpec()).map(response, requestContext);
         if (responseData.size() == 0) {
-            log.warn("No values in the SNMP response for device {}", sessionContext.getDeviceId());
+            log.warn("[{}] No values in the response", sessionContext.getDeviceId());
             throw new IllegalArgumentException("No values in the response");
         }
 
@@ -428,11 +464,11 @@ public class SnmpTransportService implements TbTransportService, CommandResponde
     @PreDestroy
     public void shutdown() {
         log.info("Stopping SNMP transport!");
-        if (queryingExecutor != null) {
+        if (scheduler != null) {
-            queryingExecutor.shutdownNow();
+            scheduler.shutdownNow();
         }
-        if (responseProcessingExecutor != null) {
+        if (executor != null) {
-            responseProcessingExecutor.shutdownNow();
+            executor.shutdownNow();
         }
         if (snmp != null) {
             try {

common/transport/snmp/src/main/java/org/thingsboard/server/transport/snmp/session/DeviceSessionContext.java

@@ -45,7 +45,6 @@ import org.thingsboard.server.transport.snmp.SnmpTransportContext;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.UUID;
-import java.util.concurrent.ScheduledFuture;
 import java.util.concurrent.atomic.AtomicInteger;
 
 @Slf4j
@@ -60,7 +59,8 @@ public class DeviceSessionContext extends DeviceAwareSessionContext implements S
     @Setter
     private SnmpDeviceTransportConfiguration deviceTransportConfiguration;
     @Getter
-    private final Device device;
+    @Setter
+    private Device device;
     @Getter
     private final TenantId tenantId;
 
@@ -73,7 +73,7 @@ public class DeviceSessionContext extends DeviceAwareSessionContext implements S
     private Runnable sessionTimeoutHandler;
 
     @Getter
-    private final List<ScheduledFuture<?>> queryingTasks = new LinkedList<>();
+    private final List<ScheduledTask> queryingTasks = new LinkedList<>();
 
     @Builder
     public DeviceSessionContext(TenantId tenantId, Device device, DeviceProfile deviceProfile, String token,

common/transport/snmp/src/main/java/org/thingsboard/server/transport/snmp/session/ScheduledTask.java

@@ -0,0 +1,62 @@
+/**
+ * Copyright © 2016-2024 The Thingsboard Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.thingsboard.server.transport.snmp.session;
+
+import com.google.common.util.concurrent.AsyncCallable;
+import com.google.common.util.concurrent.Futures;
+import com.google.common.util.concurrent.ListenableFuture;
+import com.google.common.util.concurrent.MoreExecutors;
+import lombok.Data;
+import lombok.extern.slf4j.Slf4j;
+
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+
+@Data
+@Slf4j
+public class ScheduledTask {
+    private ListenableFuture<?> scheduledFuture;
+    private boolean stopped = false;
+
+    public void init(AsyncCallable<Void> task, long delayMs, ScheduledExecutorService scheduler) {
+        schedule(task, delayMs, scheduler);
+    }
+
+    private void schedule(AsyncCallable<Void> task, long delayMs, ScheduledExecutorService scheduler) {
+        scheduledFuture = Futures.scheduleAsync(() -> {
+            if (stopped) {
+                return Futures.immediateCancelledFuture();
+            }
+            try {
+                return task.call();
+            } catch (Throwable t) {
+                log.error("Unhandled error in scheduled task", t);
+                return Futures.immediateFailedFuture(t);
+            }
+        }, delayMs, TimeUnit.MILLISECONDS, scheduler);
+        if (!stopped) {
+            scheduledFuture.addListener(() -> schedule(task, delayMs, scheduler), MoreExecutors.directExecutor());
+        }
+    }
+
+    public void cancel() {
+        stopped = true;
+        if (scheduledFuture != null) {
+            scheduledFuture.cancel(true);
+        }
+    }
+
+}

common/transport/snmp/src/test/java/org/thingsboard/server/transport/snmp/SnmpDeviceSimulatorV2.java

@@ -58,11 +58,10 @@ public class SnmpDeviceSimulatorV2 extends BaseAgent {
 
     private final Target target;
     private final Address address;
+    private final Map<String, String> mappings;
     private Snmp snmp;
 
-    private final String password;
+    public SnmpDeviceSimulatorV2(int port, String password, Map<String, String> mappings) throws IOException {
-
-    public SnmpDeviceSimulatorV2(int port, String password) throws IOException {
         super(new File("conf.agent"), new File("bootCounter.agent"), new CommandProcessor(new OctetString("12312")));
         CommunityTarget target = new CommunityTarget();
         target.setCommunity(new OctetString(password));
@@ -72,7 +71,7 @@ public class SnmpDeviceSimulatorV2 extends BaseAgent {
         target.setTimeout(1500);
         target.setVersion(SnmpConstants.version2c);
         this.target = target;
-        this.password = password;
+        this.mappings = mappings;
     }
 
     public void start() throws IOException {
@@ -85,13 +84,6 @@ public class SnmpDeviceSimulatorV2 extends BaseAgent {
         snmp = new Snmp(transportMappings[0]);
     }
 
-    public void setUpMappings(Map<String, String> oidToResponseMappings) {
-        unregisterManagedObject(getSnmpv2MIB());
-        oidToResponseMappings.forEach((oid, response) -> {
-            registerManagedObject(new MOScalar<>(new OID(oid), MOAccessImpl.ACCESS_READ_WRITE, new OctetString(response)));
-        });
-    }
-
     public void sendTrap(String host, int port, Map<String, String> values) throws IOException {
         PDU pdu = new PDU();
         pdu.addAll(values.entrySet().stream()
@@ -107,6 +99,10 @@ public class SnmpDeviceSimulatorV2 extends BaseAgent {
 
     @Override
     protected void registerManagedObjects() {
+        unregisterManagedObject(getSnmpv2MIB());
+        mappings.forEach((oid, response) -> {
+            registerManagedObject(new MOScalar<>(new OID(oid), MOAccessImpl.ACCESS_READ_WRITE, new OctetString(response)));
+        });
     }
 
     protected void registerManagedObject(ManagedObject mo) {
@@ -152,6 +148,7 @@ public class SnmpDeviceSimulatorV2 extends BaseAgent {
     }
 
     protected void unregisterManagedObjects() {
+        unregisterManagedObject(getSnmpv2MIB());
     }
 
     protected void addCommunities(SnmpCommunityMIB communityMIB) {

common/transport/snmp/src/test/java/org/thingsboard/server/transport/snmp/SnmpTestV2.java

@@ -15,28 +15,34 @@
  */
 package org.thingsboard.server.transport.snmp;
 
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.ArrayNode;
+import org.thingsboard.common.util.JacksonUtil;
+
+import java.io.File;
 import java.io.IOException;
-import java.util.HashMap;
+import java.util.LinkedHashMap;
 import java.util.Map;
 import java.util.Scanner;
+import java.util.stream.Collectors;
 
 public class SnmpTestV2 {
 
     private static final Scanner scanner = new Scanner(System.in);
 
     public static void main(String[] args) throws IOException {
-        SnmpDeviceSimulatorV2 client = new SnmpDeviceSimulatorV2(1610, "public");
+        Map<String, String> mappings = new LinkedHashMap<>();
+        for (int i = 1; i <= 50; i++) {
+            String oid = String.format("1.3.6.1.2.1.%s.1.52", i);
+            mappings.put(oid, "value_" + i);
+        }
 
-        client.start();
+        SnmpDeviceSimulatorV2 device = new SnmpDeviceSimulatorV2(1610, "public", mappings);
-        Map<String, String> mappings = new HashMap<>();
+        device.start();
-//        for (int i = 1; i <= 500; i++) {
-//            String oid = String.format(".1.3.6.1.2.1.%s.1.52", i);
-//            mappings.put(oid, "value_" + i);
-//        }
-        mappings.put("1.3.6.1.2.1.266.1.52", "****");
 
-        client.setUpMappings(mappings);
+        System.out.println("Hosting the following values:\n" + mappings.entrySet().stream()
-        inputTraps(client);
+                .map(entry -> entry.getKey() + " - " + entry.getValue())
+                .collect(Collectors.joining("\n")));
 
         scanner.nextLine();
     }
@@ -53,4 +59,18 @@ public class SnmpTestV2 {
         }
     }
 
+    private static void updateDeviceProfile(String file) throws Exception {
+        File profileFile = new File(file);
+        JsonNode deviceProfile = JacksonUtil.OBJECT_MAPPER.readTree(profileFile);
+        ArrayNode mappingsJson = (ArrayNode) deviceProfile.at("/profileData/transportConfiguration/communicationConfigs/0/mappings");
+        for (int i = 1; i <= 50; i++) {
+            String oid = String.format(".1.3.6.1.2.1.%s.1.52", i);
+            mappingsJson.add(JacksonUtil.newObjectNode()
+                    .put("oid", oid)
+                    .put("key", "key_" + i)
+                    .put("dataType", "STRING"));
+        }
+        JacksonUtil.OBJECT_MAPPER.writeValue(profileFile, deviceProfile);
+    }
+
 }

common/transport/snmp/src/test/resources/snmp-device-profile-transport-config.json

@@ -1,43 +0,0 @@
-{
-  "timeoutMs": 500,
-  "retries": 0,
-  "communicationConfigs": [
-    {
-      "spec": "TELEMETRY_QUERYING",
-      "queryingFrequencyMs": 3000,
-      "mappings": [
-        {
-          "oid": ".1.3.6.1.2.1.1.1.50",
-          "key": "temperature",
-          "dataType": "LONG"
-        },
-        {
-          "oid": ".1.3.6.1.2.1.2.1.52",
-          "key": "humidity",
-          "dataType": "DOUBLE"
-        }
-      ]
-    },
-    {
-      "spec": "CLIENT_ATTRIBUTES_QUERYING",
-      "queryingFrequencyMs": 5000,
-      "mappings": [
-        {
-          "oid": ".1.3.6.1.2.1.3.1.54",
-          "key": "isCool",
-          "dataType": "STRING"
-        }
-      ]
-    },
-    {
-      "spec": "SHARED_ATTRIBUTES_SETTING",
-      "mappings": [
-        {
-          "oid": ".1.3.6.1.2.1.7.1.58",
-          "key": "shared",
-          "dataType": "STRING"
-        }
-      ]
-    }
-  ]
-}

common/transport/snmp/src/test/resources/snmp-device-transport-config-v3.json

@@ -1,13 +0,0 @@
-{
-  "address": "192.168.3.23",
-  "port": 1610,
-  "protocolVersion": "V3",
-
-  "username": "tb-user",
-  "engineId": "qwertyuioa",
-  "securityName": "tb-user",
-  "authenticationProtocol": "SHA_512",
-  "authenticationPassphrase": "sdfghjkloifgh",
-  "privacyProtocol": "DES",
-  "privacyPassphrase": "rtytguijokod"
-}

common/transport/snmp/src/test/resources/snmp-device-transport-config.json

@@ -1,6 +0,0 @@
-{
-  "address": "127.0.0.1",
-  "port": 1610,
-  "community": "public",
-  "protocolVersion": "V2C"
-}

common/transport/snmp/src/test/resources/snmp_device_profile.json

@@ -0,0 +1,289 @@
+{
+  "name": "SNMP Device Profile",
+  "description": "",
+  "image": null,
+  "type": "DEFAULT",
+  "transportType": "SNMP",
+  "provisionType": "DISABLED",
+  "defaultRuleChainId": null,
+  "defaultDashboardId": null,
+  "defaultQueueName": null,
+  "profileData": {
+    "configuration": {
+      "type": "DEFAULT"
+    },
+    "transportConfiguration": {
+      "type": "SNMP",
+      "timeoutMs": 500,
+      "retries": 0,
+      "communicationConfigs": [
+        {
+          "spec": "TELEMETRY_QUERYING",
+          "mappings": [
+            {
+              "oid": ".1.3.6.1.2.1.1.1.52",
+              "key": "key_1",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.2.1.52",
+              "key": "key_2",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.3.1.52",
+              "key": "key_3",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.4.1.52",
+              "key": "key_4",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.5.1.52",
+              "key": "key_5",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.6.1.52",
+              "key": "key_6",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.7.1.52",
+              "key": "key_7",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.8.1.52",
+              "key": "key_8",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.9.1.52",
+              "key": "key_9",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.10.1.52",
+              "key": "key_10",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.11.1.52",
+              "key": "key_11",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.12.1.52",
+              "key": "key_12",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.13.1.52",
+              "key": "key_13",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.14.1.52",
+              "key": "key_14",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.15.1.52",
+              "key": "key_15",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.16.1.52",
+              "key": "key_16",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.17.1.52",
+              "key": "key_17",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.18.1.52",
+              "key": "key_18",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.19.1.52",
+              "key": "key_19",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.20.1.52",
+              "key": "key_20",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.21.1.52",
+              "key": "key_21",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.22.1.52",
+              "key": "key_22",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.23.1.52",
+              "key": "key_23",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.24.1.52",
+              "key": "key_24",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.25.1.52",
+              "key": "key_25",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.26.1.52",
+              "key": "key_26",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.27.1.52",
+              "key": "key_27",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.28.1.52",
+              "key": "key_28",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.29.1.52",
+              "key": "key_29",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.30.1.52",
+              "key": "key_30",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.31.1.52",
+              "key": "key_31",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.32.1.52",
+              "key": "key_32",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.33.1.52",
+              "key": "key_33",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.34.1.52",
+              "key": "key_34",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.35.1.52",
+              "key": "key_35",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.36.1.52",
+              "key": "key_36",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.37.1.52",
+              "key": "key_37",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.38.1.52",
+              "key": "key_38",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.39.1.52",
+              "key": "key_39",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.40.1.52",
+              "key": "key_40",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.41.1.52",
+              "key": "key_41",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.42.1.52",
+              "key": "key_42",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.43.1.52",
+              "key": "key_43",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.44.1.52",
+              "key": "key_44",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.45.1.52",
+              "key": "key_45",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.46.1.52",
+              "key": "key_46",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.47.1.52",
+              "key": "key_47",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.48.1.52",
+              "key": "key_48",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.49.1.52",
+              "key": "key_49",
+              "dataType": "STRING"
+            },
+            {
+              "oid": ".1.3.6.1.2.1.50.1.52",
+              "key": "key_50",
+              "dataType": "STRING"
+            }
+          ],
+          "queryingFrequencyMs": 5000
+        }
+      ]
+    },
+    "provisionConfiguration": {
+      "type": "DISABLED",
+      "provisionDeviceSecret": null
+    },
+    "alarms": null
+  },
+  "provisionDeviceKey": null,
+  "firmwareId": null,
+  "softwareId": null,
+  "defaultEdgeRuleChainId": null,
+  "default": false
+}

common/transport/transport-api/src/main/java/org/thingsboard/server/common/transport/service/DefaultTransportService.java

@@ -788,7 +788,11 @@ public class DefaultTransportService extends TransportActivityManager implements
                         .setSuccess(success)
                         .setError(error != null ? ExceptionUtils.getStackTrace(error) : ""))
                 .build();
-        sendToCore(tenantId, deviceId, msg, deviceId.getId(), TransportServiceCallback.EMPTY);
+        try {
+            sendToCore(tenantId, deviceId, msg, deviceId.getId(), TransportServiceCallback.EMPTY);
+        } catch (Exception e) {
+            log.error("[{}][{}] Failed to send lifecycle event to core", tenantId, deviceId, e);
+        }
     }
 
     @Override
@@ -801,9 +805,13 @@ public class DefaultTransportService extends TransportActivityManager implements
                         .setEntityIdLSB(deviceId.getId().getLeastSignificantBits())
                         .setServiceId(serviceInfoProvider.getServiceId())
                         .setMethod(method)
-                        .setError(ExceptionUtils.getStackTrace(error)))
+                        .setError(ExceptionUtils.getRootCauseMessage(error)))
                 .build();
-        sendToCore(tenantId, deviceId, msg, deviceId.getId(), TransportServiceCallback.EMPTY);
+        try {
+            sendToCore(tenantId, deviceId, msg, deviceId.getId(), TransportServiceCallback.EMPTY);
+        } catch (Exception e) {
+            log.error("[{}][{}] Failed to send error event to core", tenantId, deviceId, e);
+        }
     }
 
     @Override

transport/snmp/src/main/resources/tb-snmp-transport.yml

@@ -128,14 +128,18 @@ transport:
     bind_port: "${SNMP_BIND_PORT:1620}"
     response_processing:
       # parallelism level for executor (workStealingPool) that is responsible for handling responses from SNMP devices
-      parallelism_level: "${SNMP_RESPONSE_PROCESSING_PARALLELISM_LEVEL:20}"
+      parallelism_level: "${SNMP_RESPONSE_PROCESSING_PARALLELISM_LEVEL:4}"
     # to configure SNMP to work over UDP or TCP
     underlying_protocol: "${SNMP_UNDERLYING_PROTOCOL:udp}"
-    # Batch size to request OID mappings from the device (useful when the device profile has multiple hundreds of OID mappings)
+    # Maximum size of a PDU (amount of OID mappings in a single SNMP request). The request will be split into multiple PDUs if mappings amount exceeds this number
     max_request_oids: "${SNMP_MAX_REQUEST_OIDS:100}"
+    # Delay after sending each request chunk (in case the request was split into multiple PDUs due to max_request_oids)
+    request_chunk_delay_ms: "${SNMP_REQUEST_CHUNK_DELAY_MS:100}"
     response:
       # To ignore SNMP response values that do not match the data type of the configured OID mapping (by default false - will throw an error if any value of the response not match configured data types)
       ignore_type_cast_errors: "${SNMP_RESPONSE_IGNORE_TYPE_CAST_ERRORS:false}"
+    # Thread pool size for scheduler that executes device querying tasks
+    scheduler_thread_pool_size: "${SNMP_SCHEDULER_THREAD_POOL_SIZE:4}"
   sessions:
     # Session inactivity timeout is a global configuration parameter that defines how long the device transport session will be opened after the last message arrives from the device.
     # The parameter value is in milliseconds.