Azure-IoT - Raspberry pi3 Forever script exited with code: 7

Question

I'm running a forever script sending data from raspberry pi 3 to azure-iot-hub, using the following, root@raspberrypi3:~# forever start /home/pi/azure/iam/ble_azure.js

After working for about 1.5 days, I stopped getting messages at auzre-iot-hub, when I checked forever list I got the following:

root@raspberrypi3:~# forever list
info:    Forever processes running
data:        uid  command         script                          forever pid  id logfile                 uptime         
data:    [0] NWgI /usr/bin/nodejs /home/pi/azure/iam/ble_azure.js 8990    3784    /root/.forever/NWgI.log 0:21:17:38.742

When I checked the log file I get this error message:

/home/pi/azure/iam/node_modules/applicationinsights/AutoCollection/Exceptions.js:27
                        throw error;
                        ^
NotConnectedError: mqtt.js returned client disconnecting error
    at translateError (/home/pi/azure/iam/node_modules/azure-iot-device-mqtt/lib/mqtt-translate-error.js:25:11)
    at MqttTwinReceiver._handleError (/home/pi/azure/iam/node_modules/azure-iot-device-mqtt/lib/mqtt-twin-receiver.js:201:42)
    at /home/pi/azure/iam/node_modules/azure-iot-device-mqtt/lib/mqtt-twin-receiver.js:64:18
    at MqttClient._checkDisconnecting (/home/pi/azure/iam/node_modules/mqtt/lib/client.js:314:7)
    at MqttClient.subscribe (/home/pi/azure/iam/node_modules/mqtt/lib/client.js:423:12)
    at /home/pi/azure/iam/node_modules/azure-iot-device-mqtt/lib/mqtt-twin-receiver.js:62:22
    at _combinedTickCallback (internal/process/next_tick.js:73:7)
    at process._tickCallback (internal/process/next_tick.js:104:9)
error: Forever detected script exited with code: 7
error: Script restart attempt #34
state has changed poweredOn
started scanning
[IoT hub Client] Connect error: mqtt.js returned premature close error

Through the log file, mqtt error keeps happening multiple times and forever handled it successfully, what I can't understand why after 1.5 days, I get this error:

**error: Forever detected script exited with code: 7
error: Script restart attempt #34**

Also why I keep getting such mqtt error, why it keeps disconnecting?

**NotConnectedError: mqtt.js returned client disconnecting error**


Forever --version 
v0.15.3

root@raspberrypi3:~# uname -a
Linux raspberrypi3 4.9.35-v7+ #1014 SMP Fri Jun 30 14:47:43 BST 2017 armv7l GNU/Linux

Thanks

pierreca - MSFT pierreca - MSFT · Accepted Answer · 2017-10-24T19:14:34

If you're using Client.fromConnectionString to instantiate the client object the SDK disconnects and reconnects every 45 minutes to renew the shared access signature token. (it doesn't happen with AMQP that uses a different authentication mechanism). It might be that when re-establishing the connection the client hits this "premature close" error that we've been tracking in this issue.

There are 2 things that could help limit potential errors linked to disconnecting/reconnecting:

Use X509 certificates instead of connection strings to authenticate.
Create a client object using Client.fromSharedAccessSignature and build a long-lived signature that does not require disconnecting and reconnecting as often.

Last but not least, the next release of the SDK (1.2.0) will include a retry/reconnect logic that is way more robust than what was there before. I'll update the issue to point to it when it is released.

Azure-IoT - Raspberry pi3 Forever script exited with code: 7

1 Answers