Second Attemps to AT+CIPOPEN crashes the device

[Vincrl]

Using Adafruit FONA-3G,

First attempt to use AT+CIPOPEN is successful and then after disconnecting it, the second one send back an OK but nothing else and times out. The device then needs to be reseted or it resets itself after a long period of time.

First connection:

	---> AT+CIPOPEN=0,"TCP","broker.hivemq.com",1883
	<--- OK
	<--- +CIPOPEN: 0,0

Second connection:

	---> AT+CIPOPEN=0,"TCP","broker.hivemq.com",1883
	<--- OK
	<---

Need to investigate more on how to properly close a TCP Connection.