B4J Question mqtt.close takes 30 seconds to close connection

Solution
There is a 30 seconds timeout in the underlying library. I guess that the server doesn't receive the "disconnect" packet when it happens.
If it is problematic for your use case then you can create a new client each time:
B4X: 
  If mqtt.IsInitialized Then mqtt.Close
      Dim mqtt As MqttClient
     mqtt.Initialize("mqtt", "ssl://io.adafruit.com:8883", "B4X" & Rnd(0, 999999999))
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Erel

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There is a 30 seconds timeout in the underlying library. I guess that the server doesn't receive the "disconnect" packet when it happens.
If it is problematic for your use case then you can create a new client each time:
B4X: 
  If mqtt.IsInitialized Then mqtt.Close
      Dim mqtt As MqttClient
     mqtt.Initialize("mqtt", "ssl://io.adafruit.com:8883", "B4X" & Rnd(0, 999999999))
 
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