B4R Question Error subscribing to MQTT topic on io.adafruit.com

[bdunkleysmith]

Due to issues documented here I chose an alternative method for a Google Assistant driven IR remote control project I'm working on. The method uses MQTT based on this article and utilizes Adafruit IO to provide the MQTT Broker service.

However I am encountering a problem subscribing to the topic (feed) on Adafruit IO.

Here is the relevant section of my code:

Sub ConnectToBroker(unused As Byte)
    If mqtt.Connect = False Then       
        Dim mo As MqttConnectOptions
        mo.Initialize(MQTT_NAME, MQTT_PASS)
        mqtt.Connect2(mo)
        Log("Trying to connect again")
        CallSubPlus("ConnectToBroker", 1000, 0)
        Return
    End If
    Log("Connected to broker")
    mqtt.Subscribe("bryond/feeds/channel", 0)
End Sub

Sub Mqtt_MessageArrived (Topic As String, Payload() As Byte)
    Log("Message arrived. Topic=", Topic, " payload: ", Payload)       
End Sub

The resultant log is:

Connected to broker
Message arrived. Topic=anon/errors payload: "subscription to bryond/feeds/channel failed: not available"

However the "channel" topic (feed) is available and if I subscribe using a wildcard via the following code:

Sub ConnectToBroker(unused As Byte)
    If mqtt.Connect = False Then       
        Dim mo As MqttConnectOptions
        mo.Initialize(MQTT_NAME, MQTT_PASS)
        mqtt.Connect2(mo)
        Log("Trying to connect again")
        CallSubPlus("ConnectToBroker", 1000, 0)
        Return
    End If
    Log("Connected to broker")
    mqtt.Subscribe("bryond/feeds/#", 0)
End Sub

The resultant log does not show a subscription error and on changing the channel topic value it shows those values are received OK, but in the multiple formats provided by Adafruit IO:

Connected to broker
Message arrived. Topic=bryond/feeds/channel payload: 200
Message arrived. Topic=bryond/feeds/channel/csv payload: 200,,,
Message arrived. Topic=bryond/feeds/963213 payload: 200
Message arrived. Topic=bryond/feeds/963213/csv payload: 200,,,
Message arrived. Topic=bryond/feeds/channel payload: 201
Message arrived. Topic=bryond/feeds/channel/csv payload: 201,,,
Message arrived. Topic=bryond/feeds/963213 payload: 201
Message arrived. Topic=bryond/feeds/963213/csv payload: 201,,,

Of course I can filter the received messages to extract just the data I require, but looking forward to when I may have multiple topics (feeds), it would be preferable to subscribe specifically to the desired topic (feed).

Incidentally while the MQTT API Documentation suggests using "+" in lieu of "#" as a wildcard would eliminate the /csv feed, when trying that I received a subscription error:

Message arrived. Topic=anon/errors payload: "subscription to bryond/feeds/+ failed: not available"

Has anyone had experience subscribing to topics (feeds) on Adafruit IO and if so, what syntax did you find allowed subscription to the desired topic (feed)?

 

[embedded]

My feed name is
username/feeds/LED
it works for me