diff --git a/machinery/src/routers/mqtt/main.go b/machinery/src/routers/mqtt/main.go
index 1e3e4fa..2f01af6 100644
--- a/machinery/src/routers/mqtt/main.go
+++ b/machinery/src/routers/mqtt/main.go
@@ -457,7 +457,12 @@ func HandleReceiveHDCandidates(mqttClient mqtt.Client, hubKey string, payload mo
 
 	if receiveHDCandidatesPayload.Timestamp != 0 {
 		if communication.CameraConnected {
-			channel := webrtc.CandidateArrays[receiveHDCandidatesPayload.SessionID]
+			key := configuration.Config.Key + "/" + receiveHDCandidatesPayload.SessionID
+			channel := webrtc.CandidateArrays[key]
+			if channel == nil {
+				channel = make(chan string)
+				webrtc.CandidateArrays[key] = channel
+			}
 			log.Log.Info("HandleReceiveHDCandidates: " + receiveHDCandidatesPayload.Candidate)
 			channel <- receiveHDCandidatesPayload.Candidate
 		} else {
diff --git a/machinery/src/webrtc/main.go b/machinery/src/webrtc/main.go
index 057d1eb..0ebd8f3 100644
--- a/machinery/src/webrtc/main.go
+++ b/machinery/src/webrtc/main.go
@@ -125,6 +125,7 @@ func InitializeWebRTCConnection(configuration *models.Configuration, communicati
 						Credential: w.TurnServersCredential,
 					},
 				},
+				ICETransportPolicy: pionWebRTC.ICETransportPolicyRelay,
 			},
 		)
 
@@ -215,7 +216,7 @@ func InitializeWebRTCConnection(configuration *models.Configuration, communicati
 				payload, err := models.PackageMQTTMessage(configuration, message)
 				if err == nil {
 					log.Log.Info("InitializeWebRTCConnection:" + string(candateBinary))
-					token := mqttClient.Publish("kerberos/hub/"+hubKey, 0, false, payload)
+					token := mqttClient.Publish("kerberos/hub/"+hubKey, 2, false, payload)
 					token.Wait()
 				} else {
 					log.Log.Info("HandleRequestConfig: something went wrong while sending acknowledge config to hub: " + string(payload))
@@ -241,7 +242,7 @@ func InitializeWebRTCConnection(configuration *models.Configuration, communicati
 				}
 				payload, err := models.PackageMQTTMessage(configuration, message)
 				if err == nil {
-					token := mqttClient.Publish("kerberos/hub/"+hubKey, 0, false, payload)
+					token := mqttClient.Publish("kerberos/hub/"+hubKey, 2, false, payload)
 					token.Wait()
 				} else {
 					log.Log.Info("HandleRequestConfig: something went wrong while sending acknowledge config to hub: " + string(payload))