Yeah that’s right - that’s really the premise of why I wanted a lower baud rate and why I was using the hardware serial to get there. Note I’m using purely the hardware serial above 
this baby has an extra hw serial (I use it also to run the TTN lib) and its 3v3 so no levelshifters
I have same problem… no comunication between Leonardo or Mega 2560 and RAK811 via serial1
I have checked jumpers, Q’s, and all its fine… 3v3 signal get into RAK811 by UARTrx pin (oscilloscope used), but UARTTx pin doesnt respond…
If I send AT comands via USB-PC the board works fine
I tried to change bps (even 110000 ??), but nothing…
Any idea?
SOLVED:
The level sifhter built in RAK811 board cant work at preset RAK811 baudrate (115200) so:
at+uart=9600,8,0,0,0
Now arduino (Leonardo, Mega…) can talk with board (serial1.begin(9600))
I’ve successfully connected the RAK811 with a USB-UART converter and managed to run all the AT commands comfortably…
Had to do this -> at+uart=9600,8,0,0,0 at 115200 to make the RAK811 talk with the computer.
Now, I am trying to make the RAK811 talk to the Arduino Uno… Using SoftwareSerial to do the same. Have run all the AT commands except the last one (at+send), which is throwing up an unforseen error…
Hey all.
I managed to run the RAK811 with the Arduino finally, including the at+send command…
at+send=0,2,010203040506\r\n
Had to change the payload to something specific like above, don’t know why… It did not work with a shorter length payload (eg. ) 0102. If any one has an answer, kindly reply…
So that takes care of the RAK811 board… Both USB-UART & Arduino interfacing done. 