Add renewAddress to MQTT examples if connect fails

[TMRh20]

With the recent changes to RF24Mesh involving the checkConnection() function now verifying connectivity only with its parent node, additional checks can help maintain connectivity when direct connectivity to the master node is required.

• Update MQTT examples to renew their address if unable to connect to the MQTT server

[github-actions]

Memory usage change @ b0ae98a

Board	flash	%	RAM for global variables	%
arduino:avr:nano	🔺 0 - +28	0.0 - +0.09	0 - 0	0.0 - 0.0
arduino:samd:mkrzero	💚 -8 - 0	-0.0 - 0.0	0 - 0	0.0 - 0.0

Click for full report table

Board	examples/Getting_Started_SimpleClient_Mesh flash	%	examples/Getting_Started_SimpleClient_Mesh RAM for global variables	%	examples/Getting_Started_SimpleServer_Mesh flash	%	examples/Getting_Started_SimpleServer_Mesh RAM for global variables	%	examples/InteractiveServer_Mesh flash	%	examples/InteractiveServer_Mesh RAM for global variables	%	examples/MQTT/mqtt_basic flash	%	examples/MQTT/mqtt_basic RAM for global variables	%	examples/MQTT/mqtt_basic_2 flash	%	examples/MQTT/mqtt_basic_2 RAM for global variables	%	examples/MQTT/mqtt_basic_no_blk flash	%	examples/MQTT/mqtt_basic_no_blk RAM for global variables	%	examples/SimpleClient_Mesh flash	%	examples/SimpleClient_Mesh RAM for global variables	%
arduino:avr:nano	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	28	0.09	0	0.0	28	0.09	0	0.0	N/A	N/A	N/A	N/A	0	0.0	0	0.0
arduino:samd:mkrzero	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	-8	-0.0	0	0.0	-8	-0.0	0	0.0	N/A	N/A	N/A	N/A	0	0.0	0	0.0

Click for full report CSV

Board,examples/Getting_Started_SimpleClient_Mesh<br>flash,%,examples/Getting_Started_SimpleClient_Mesh<br>RAM for global variables,%,examples/Getting_Started_SimpleServer_Mesh<br>flash,%,examples/Getting_Started_SimpleServer_Mesh<br>RAM for global variables,%,examples/InteractiveServer_Mesh<br>flash,%,examples/InteractiveServer_Mesh<br>RAM for global variables,%,examples/MQTT/mqtt_basic<br>flash,%,examples/MQTT/mqtt_basic<br>RAM for global variables,%,examples/MQTT/mqtt_basic_2<br>flash,%,examples/MQTT/mqtt_basic_2<br>RAM for global variables,%,examples/MQTT/mqtt_basic_no_blk<br>flash,%,examples/MQTT/mqtt_basic_no_blk<br>RAM for global variables,%,examples/SimpleClient_Mesh<br>flash,%,examples/SimpleClient_Mesh<br>RAM for global variables,%
arduino:avr:nano,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,28,0.09,0,0.0,28,0.09,0,0.0,N/A,N/A,N/A,N/A,0,0.0,0,0.0
arduino:samd:mkrzero,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,-8,-0.0,0,0.0,-8,-0.0,0,0.0,N/A,N/A,N/A,N/A,0,0.0,0,0.0

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[2bndy5]

LGTM