* add JSON parse option to RS232 gateway * add hardware UART support to RS232 gateway * changed default RS232toMQTTmode to raw (instead of JSON) * removed reference to Arduino Mega in RS232 gateway config * update RS232 gateway doc
* add JSON parse option to RS232 gateway * add hardware UART support to RS232 gateway * changed default RS232toMQTTmode to raw (instead of JSON) * removed reference to Arduino Mega in RS232 gateway config * update RS232 gateway doc