Raja-Raman

I have the same issue, but in a simpler scenario. I am not even trying to switch between channels: [link 1](https://stackoverflow.com/questions/51352038/how-to-cleanly-shut-down-an-android-paho-mqtt-service) The problem seems to be that disconnect() does not...

try adding `WiFi.mode(WIFI_STA);` before attempting wi-fi connection. See this thread: https://github.com/knolleary/pubsubclient/issues/138