Android Question MQTT Chat with Auto Discovery

postasat · Apr 24, 2020

Hi,
I would like to use "MQTT Chat with Auto Discovery" with internet cloud service.
I tried with the free service on https://www.maqiatto.com with the following code:

B4X:

    client.Initialize("client", "tcp://maqiatto.com:8883", "android" & Rnd(1, 10000000))
    Dim mo As MqttConnectOptions
    mo.Initialize("my username", "my password")
    client.Connect2(mo)

but I have a connection error (success=false):

"Error connecting: (MqttException) Unexpected error (6)"

How can I solve it ?

Do you know a simple way to connect to a free MQTT cloud service ?

Thank you.

barx · Apr 25, 2020

I believe the use of port 8883 is default for secure connections. Try changing

B4X:

"tcp://maqiatto.com:8883"

to

B4X:

"ssl://maqiatto.com:8883"

postasat · Apr 26, 2020

Hi,
the correct code is with port 1883.

B4X:

client.Initialize("client", "tcp://maqiatto.com:1883", "android" & Rnd(1, 10000000))
    Dim mo As MqttConnectOptions
    mo.Initialize("my username", "my password")
    client.Connect2(mo)

Now I can connect, but when I push "start server", the code doesn't open chat page.
And if I start another phone as client, the button "Connect As Client" remains disabled.
Maybe the autodiscovery function is not made for mqtt cloud server ?

Android Question MQTT Chat with Auto Discovery

postasat

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barx

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postasat

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Android Question MQTT Chat with Auto Discovery

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