diff --git a/cdk/BackendLambdas.d.ts b/cdk/BackendLambdas.d.ts
index 3a000cf..f23e3b0 100644
--- a/cdk/BackendLambdas.d.ts
+++ b/cdk/BackendLambdas.d.ts
@@ -11,4 +11,5 @@ type BackendLambdas = {
 	onNewNetworkSurvey: PackedLambda
 	onNetworkSurveyLocated: PackedLambda
 	parseSinkMessages: PackedLambda
+	nrplusGatewayScan: PackedLambda
 }
diff --git a/cdk/backend.ts b/cdk/backend.ts
index 947d45e..34604ac 100644
--- a/cdk/backend.ts
+++ b/cdk/backend.ts
@@ -46,6 +46,7 @@ new BackendApp({
 		onNewNetworkSurvey: await pack('onNewNetworkSurvey'),
 		onNetworkSurveyLocated: await pack('onNetworkSurveyLocated'),
 		parseSinkMessages: await pack('parseSinkMessages'),
+		nrplusGatewayScan: await pack('nrplusGatewayScan'),
 	},
 	layer: await packLayer({
 		id: 'baseLayer',
diff --git a/cdk/resources/NRPlusGateway.ts b/cdk/resources/NRPlusGateway.ts
index 9394ad2..5340d53 100644
--- a/cdk/resources/NRPlusGateway.ts
+++ b/cdk/resources/NRPlusGateway.ts
@@ -1,5 +1,7 @@
 import { Duration, Stack } from 'aws-cdk-lib'
 import IAM from 'aws-cdk-lib/aws-iam'
+import Events from 'aws-cdk-lib/aws-events'
+import EventsTargets from 'aws-cdk-lib/aws-events-targets'
 import Iot from 'aws-cdk-lib/aws-iot'
 import Kinesis, { StreamMode } from 'aws-cdk-lib/aws-kinesis'
 import Lambda, { StartingPosition } from 'aws-cdk-lib/aws-lambda'
@@ -16,6 +18,7 @@ export class NRPlusGateway extends Construct {
 		}: {
 			lambdaSources: {
 				parseSinkMessages: PackedLambda
+				nrplusGatewayScan: PackedLambda
 			}
 		},
 	) {
@@ -70,30 +73,34 @@ export class NRPlusGateway extends Construct {
 			},
 		})
 
-		const parseSinkMessages = new Lambda.Function(this, 'lambda', {
-			handler: lambdaSources.parseSinkMessages.handler,
-			architecture: Lambda.Architecture.ARM_64,
-			runtime: Lambda.Runtime.NODEJS_18_X,
-			timeout: Duration.minutes(15),
-			memorySize: 1792,
-			code: Lambda.Code.fromAsset(
-				lambdaSources.parseSinkMessages.lambdaZipFile,
-			),
-			description: 'Parse sink messages',
-			environment: {
-				VERSION: this.node.tryGetContext('version'),
+		const parseSinkMessagesFn = new Lambda.Function(
+			this,
+			'parseSinkMessagesFn',
+			{
+				handler: lambdaSources.parseSinkMessages.handler,
+				architecture: Lambda.Architecture.ARM_64,
+				runtime: Lambda.Runtime.NODEJS_18_X,
+				timeout: Duration.minutes(15),
+				memorySize: 1792,
+				code: Lambda.Code.fromAsset(
+					lambdaSources.parseSinkMessages.lambdaZipFile,
+				),
+				description: 'Parse sink messages',
+				environment: {
+					VERSION: this.node.tryGetContext('version'),
+				},
+				initialPolicy: [
+					new IAM.PolicyStatement({
+						actions: ['iot:UpdateThingShadow'],
+						resources: ['*'],
+					}),
+				],
+				logRetention: Logs.RetentionDays.ONE_WEEK,
+				reservedConcurrentExecutions: 1,
 			},
-			initialPolicy: [
-				new IAM.PolicyStatement({
-					actions: ['iot:UpdateThingShadow'],
-					resources: ['*'],
-				}),
-			],
-			logRetention: Logs.RetentionDays.ONE_WEEK,
-			reservedConcurrentExecutions: 1,
-		})
+		)
 
-		parseSinkMessages.addEventSource(
+		parseSinkMessagesFn.addEventSource(
 			new KinesisEventSource(stream, {
 				startingPosition: StartingPosition.TRIM_HORIZON,
 				batchSize: 100,
@@ -101,5 +108,45 @@ export class NRPlusGateway extends Construct {
 				parallelizationFactor: 1,
 			}),
 		)
+
+		// Trigger scan message periodically
+		const nrplusGatewayScanFn = new Lambda.Function(
+			this,
+			'nrplusGatewayScanFn',
+			{
+				handler: lambdaSources.nrplusGatewayScan.handler,
+				architecture: Lambda.Architecture.ARM_64,
+				runtime: Lambda.Runtime.NODEJS_18_X,
+				timeout: Duration.seconds(60),
+				memorySize: 1792,
+				code: Lambda.Code.fromAsset(
+					lambdaSources.nrplusGatewayScan.lambdaZipFile,
+				),
+				description:
+					'Periodically trigger scan in sink to sync with relay, required to communicate reliably with relay and relay-connected clients',
+				environment: {
+					VERSION: this.node.tryGetContext('version'),
+				},
+				initialPolicy: [
+					new IAM.PolicyStatement({
+						actions: ['iot:ListThings', 'iot:Publish'],
+						resources: ['*'],
+					}),
+				],
+				logRetention: Logs.RetentionDays.ONE_DAY,
+			},
+		)
+
+		const rule = new Events.Rule(this, 'Rule', {
+			schedule: Events.Schedule.expression('rate(1 minute)'),
+			description: `Invoke the summary lambda`,
+			enabled: true,
+			targets: [new EventsTargets.LambdaFunction(nrplusGatewayScanFn)],
+		})
+
+		nrplusGatewayScanFn.addPermission('InvokeByEvents', {
+			principal: new IAM.ServicePrincipal('events.amazonaws.com'),
+			sourceArn: rule.ruleArn,
+		})
 	}
 }
diff --git a/lambda/nrplusGatewayScan.ts b/lambda/nrplusGatewayScan.ts
new file mode 100644
index 0000000..14e3c33
--- /dev/null
+++ b/lambda/nrplusGatewayScan.ts
@@ -0,0 +1,35 @@
+import { IoTClient, ListThingsCommand } from '@aws-sdk/client-iot'
+import {
+	IoTDataPlaneClient,
+	PublishCommand,
+} from '@aws-sdk/client-iot-data-plane'
+
+const iot = new IoTClient({})
+const iotData = new IoTDataPlaneClient({})
+
+/**
+ * Periodically trigger scan in sink to sync with relay,
+ * required to communicate reliably with relay and relay-connected clients
+ */
+export const handler = async (): Promise<void> => {
+	const { things: gateways } = await iot.send(
+		new ListThingsCommand({
+			thingTypeName: 'nrplus-gateway',
+		}),
+	)
+
+	await Promise.all(
+		(gateways ?? []).map(async ({ thingName }) => {
+			const topic = `${thingName}/nrplus-ctrl`
+			const payload = `dect beacon_scan -c 1667 -f -t 2`
+			console.log(`>`, topic, JSON.stringify(payload))
+			return iotData.send(
+				new PublishCommand({
+					topic,
+					payload: Buffer.from(payload, 'hex'),
+					qos: 1,
+				}),
+			)
+		}),
+	)
+}