1、the Nx has three uart(uart0,uart1,uart2), uart2 is for debug function.
2、Our Design is used in the unattended station scene，to prevent system halted，the uart_tx of uart2 is attached to one microcontroler for monitoring the Nx 。The microcontroler check the heartbeat From uart_tx of NX.
3、question:nx start working a few secondes. the uart2 point out :need to sign in, if not log in，No debug information
is show.the microconroler has no way to judge the status of NX.
4、we want the uart2-Tx send heartbeat command。
has good method?
how about enable the auto-login functionality?
you may send commands through uart serial port, the default uart baudrate is 115200/8n1,
the uart2 works as login control terminal。
we hope the uart2 works as debug serial.for example, time of 1S print a message.the microcontroler check the message to juge the nx is live.
of cource,wo use the [Development Board] one GPIO of NX connect to microcontroler ，a shell runing set gpio 1 ,set gpio 0.is ok.
please also refer to Topic 145106 for changing serial console to other uart.