XBee pin hybernate bug fix
XBee Firmware version is 2xA7
pin hybernate
Change XBee setting
change XBee setting
increase a SendQue size for Arduino to 5
add document MqttsClient over view
change PUBLISH & SUBSCRIBE to support QoS0 correctly.
change PUBLISH & SUBSCRIBE
Timer for sleeping
update Timer for KeepAlive to adjust the sleeping time.
update Timer