fixed reset at 0x4024b87d
fixed reset at 0x4024b87d

mqtt_tcpclient_connect_cb()

check for null pointer before deref

https://github.com/arduino-org/Esp-Link/blob/master/mqtt/mqtt.c

nabovarme/MeterLogger,nabovarme/MeterLogger,nabovarme/MeterLogger,nabovarme/MeterLogger,nabovarme/MeterLogger