nRF52840-DK and RAK811 WisNode (v1.2)

Question

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 · Accepted Answer

I managed to get it to work, here is what I did: 
 
 Put it on top of the nRF52840-DK as you would attach it to an arduino. 
 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
 };
 
 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 "
" after every line (if you use nRF Connect or nRF Toolbox - they wont send "
" after a line)

nRF52840-DK and RAK811 WisNode (v1.2)

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