nRF52840-DK and RAK811 WisNode (v1.2)

[Or]

Hi,

Anybody managed to connect a WisNode RAK811 to an nRF52840-DK and make them "talk" ? (send "at" commands to the RAK811 shield and get replies)

How did you connect it ?
using wires ?
simply attached it on top of the DK ?
what jumper configuration on the RAK811 ?

[Or]

I managed to get it to work, here is what I did:

1. Put it on top of the nRF52840-DK as you would attach it to an arduino.
2. Setup UART in your code like so:
   

       app_uart_comm_params_t const comm_params =
       {
           .rx_pin_no    = ARDUINO_0_PIN,
           .tx_pin_no    = ARDUINO_1_PIN,
           .rts_pin_no   = RTS_PIN_NUMBER,
           .cts_pin_no   = CTS_PIN_NUMBER,
           .flow_control = APP_UART_FLOW_CONTROL_DISABLED,
           .use_parity   = false,
   #if defined (UART_PRESENT)
           .baud_rate    = NRF_UART_BAUDRATE_115200
   #else
           .baud_rate    = NRF_UARTE_BAUDRATE_115200
   #endif
       };
   

3. Power the nRF52840-DK through the *USB* input (not the SEGGER/programming input).

That's it, now you can flash the board with examples/ble_peripheral/ble_app_uart and send at commands to it.

Have fun.

PS: examples/ble_peripheral/ble_app_uart wont work out of the box.
You need to add code for sending "\r\n" after every line (if you use nRF Connect or nRF Toolbox - they wont send "\r\n" after a line)