MQTT topics about azure-iot-protocol-gateway HOT 10 CLOSED

@snobu, can you try adding "/" to topic name? If that works then it is an issue we'll address very soon.

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No go.

'$PG.Unmatched': 'True'
'$PG.Subject': '/devices/Mega/messages/events'

The following works, which makes me wonder what topic is the C# SDK publishing to. Not trivial to sniff the MQTT packets since i'm not aware of a way to keep it from doing TLS (is there a way?):

// talk MQTT to IoT Hub
deviceClient = DeviceClient.Create(iotHubUri,
  new DeviceAuthenticationWithRegistrySymmetricKey(deviceName, deviceKey), TransportType.Mqtt);

...

var messageString = JsonConvert.SerializeObject(telemetryDataPoint);
var message = new Message(Encoding.ASCII.GetBytes(messageString));
await deviceClient.SendEventAsync(message);

Again, i'm talking to IoT Hub directly, not to a protocol gateway, so i'm just assuming the topic structure is the same. Thanks for looking into this.

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did you add the slash and it's still without the slash in EventHub? ok.. can you try devices/Mega/messages/events/a=b?

from azure-iot-protocol-gateway.

That works. It also works just by having a trailing slash.

Thanks!

BTW, what is the meaning of that trailing slash?

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There is no actual reason not to support topic without a slash at the end and it will be fixed.

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still not fixed as of today... :-(

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Anyone have any idea why I can't get data using mqtt.fx connecting to mysolution}.azure-devices.net?

I can successfully subscribe using Client ID HP9470mMQTTFX - I get the green light connected.

I can then subscribe to all of these:
devices/HP9470mMQTTFX/messages/events/#
devices/1CB19D/messages/events/#
devices/HP9470mMQTTFX/messages/devicebound/#
devices/1CB19D/messages/devicebound/#

My real device 1CB19D shows updates in Device Explorer (gui tool) and iothub-explorer (command line tool)

But my MQTT.fx client never sees anything, including 1CB19D and anything I try from publish such as publishing to:
Topic: devices/HP9470mMQTTFX/messages/events/
Value: Hello

doesn't work (never see it in subscriptions)

I have some experience with other MQTT brokers and haven't had this problem but clearly Azure MQTT is different.

===edited===>
I can also publish from mqtt.fx using:
topic: devices/HP9470mMQTTFX/messages/events/
value: Hello

and that makes it to the above mentioned Explorers but not to the above mentioned subscriptions in mqtt.fx.

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@jtmoderate876 The Protocol Gateway is not a MQTT broker. The Protocol Gateway provides protocol translation for the IoT Hub. A good place to start learning about this is here https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-what-is-iot-hub .

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@jtmoderate876, did you find way to subscribe the messages in MQTT.fx when you publish?

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No, you can’t, it is not a real MQTT broker.

@rabichaud is exactly right.

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