B4J Question MQTT first test

[giggetto71]

guys,
I am using jMQTT library and JMQTTBroker libraries for a small test: local networ, raspberry PI and my pc.
the broker runs on the raspberry pi @ 192.168.1.5 where the broker is initialized and on client publishes a random number every 5 seconds on the topic "RandomNumbers"
On the PC side I have a B4J app that connects to the raspberry PI MQTT connections and correctly receives the random numbers published by the raspberry PI on the topic "RandomNumbers".
in the same b4J app I am trying to publish a start/stop command to the raspberry PI to stop or start publishing the random numbers.
for some reasons that I can't understand it seems that while the messages from the raspberry PI flow nicely to the B4J app, the other way oround does not work..

In B4J app start
....

Dim clientId As String = Rnd(0, 999999999) & DateTime.Now
mqtt.Initialize("mqtt", "tcp://192.168.1.5:51041", clientId)
Dim mo As MqttConnectOptions
mo.Initialize(user, password)
mqtt.Connect2(mo)
mqtt.Subscribe("RandomNumber", 0)

....

then in

Private Sub mqtt_MessageArrived (Topic As String, Payload() As Byte)
    Dim obj As Object = serializator.ConvertBytesToObject(Payload)
    Dim ii As Int = obj
    Label1.Text = Topic & ":" & ii
end sub

then I have 1 button where I publish on the topic "command" to the raspberry PI the payload "stop"

Sub Button1_MouseClicked (EventData As MouseEvent)
   mqtt.Publish2("command", serializator.ConvertObjectToBytes("stop"),1,True)
end sub

On the Raspberry PI side, I have the broker initialized and the code which publishes a new random number every 5 seconds. unfortunately the event

sub mqttclient_MessageArrived

does not fire when I publish the message from the B4J app.


Any hint to try to understand what is wrong?
thanks!

 

[Erel]

Please edit your post and add [code]code here...[/code] tags.

 

[Siam]

hello,

if i understand you right, you press the button to publish "command" and on the other site nothing happens? have you on the othersite

mqtt.Subscribe("command",0)

in your code?

greetings

andy

 

[giggetto71]

YES!!!!!!
that was the problem....Rookie mistake! THANKS Siam!

 

[Siam]