android-mqtt | MQTT在Android上的二次封装,使用更加简单方便。
kandi X-RAY | android-mqtt Summary
kandi X-RAY | android-mqtt Summary
MQTT在Android上的二次封装,使用更加简单方便。
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QUESTION
I am trying to publish a message to my MQTT broker(which is my Raspberry Pi) for the topic rpi/gpio. The aim of sending that message is to turn on/off an LED connected to my Raspberry Pi(like in this tutorial but that tutorial is for Swift not Android). So when I turn on the switch widget on my Android app, the message "on" will be published to the Raspberry Pi broker to turn it on(via a python script also connected to MQTT on the Raspberry Pi). Without all the MQTT codes, the fragment below works well by displaying the switch. However, with the following codes, it crashes.
...ANSWER
Answered 2018-Mar-06 at 22:00If you follow the error in the paho source code, you'll find that the NPE is caused by the mqttService of the client being null
. You need to wait for the connection to the service to be established before publishing messages, the right place would be onSuccess
of the callback, which you are basically ignoring
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