Mesh serial rx

[Duy]

Hello,

I have just started working with mesh and I'm using the 0.9.2 Mesh SDK. When I use the Serial interface (nrf_mesh_serial) I don't see any function about rx or rx callback. Is it true that Mesh doesn't support rx interface or I have to write it? If it supports, where can I find it?

Thank you very much

[Hung Bui]

Hi Duy,

The mesh serial interface does support rx. If not how would it take the commands from peer device (PC) :) ?

UART data is processed in serial_uart.c in serial_uart_process() function.

The documentation of serial interface can be found here.

If you want to handle extra application command, when you declare nrf_mesh_serial_init() you can define the call back function that you will handle application command there. The opcode for application command should be in the range of SERIAL_OPCODE_CMD_RANGE_APP_START and SERIAL_OPCODE_CMD_RANGE_APP_END.

[Duy]

Thank you very much Hung, I finally did it. I just need to point the callback pointer in serial_uart.h to a callback function. There is still one thing I'm trying to understand is that when I use a tx callback in serial_uart the function nrf_mesh_serial_tx() doesn't send anything to the serial monitor of PC.

[Hung Bui]

I'm not sure I understand what you modified in serial_uart.h. Normally it's not needed. You just need to declare your callback in nrf_mesh_serial_init().

When you call nrf_mesh_serial_tx() have you checked you have NRF_SUCCESS returned ?

[Duy]

I declared a callback in nrf_mesh_serial_init() but It seems that the callback function doesn't execute when there is a serial event. This is part of my code, I am modifying the example for sure. I attached the run result in this command too. run_result.txt

All the function returned NRF_SUCCESS (0) but the callback function doesn't execute. Did I make any mistake? Once again, thank you very much for your support

[Hung Bui]

This is my main loop:

void nrf_mesh_rx_cb(const uint8_t p_data, uint32_t length) { 
	__LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "Rx received\r\n"); 
}
int main(void)
{
#if defined(NRF51) && defined(NRF_MESH_STACK_DEPTH)
    stack_depth_paint_stack();
#endif


    __LOG_INIT(LOG_MSK_DEFAULT | LOG_SRC_ACCESS | LOG_SRC_SERIAL | LOG_SRC_APP, LOG_LEVEL_INFO, log_callback_rtt);
    __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "----- Bluetooth Mesh Serial Interface Application -----\n");

    NRF_GPIO->DIRSET = 0xFFFFFFFF;
    NRF_GPIO->OUT    = LEDS_MASK;

    /* Flash leds at boot */
    for (int i = 0; i < 10; ++i)
    {
        NRF_GPIO->OUT ^= BSP_LED_0_MASK;
        nrf_delay_ms(100);
    }

    mesh_core_setup();

    /* Initialize dsm and access */
    dsm_init();
    access_init();

    __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "Enabling ECDH offloading...\n");
    nrf_mesh_opt_t value = {.len = 4, .opt.val = 1 };
    ERROR_CHECK(nrf_mesh_opt_set(NRF_MESH_OPT_PROV_ECDH_OFFLOADING, &value));

    __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "Enabling serial interface...\n");
    ERROR_CHECK(nrf_mesh_serial_init(nrf_mesh_rx_cb));
    ERROR_CHECK(nrf_mesh_serial_enable());

    __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "Initialization complete!\n");
    NRF_GPIO->OUTCLR = BSP_LED_0_MASK;
    uint32_t result;
    char hello[] = "\r\nHello from Nordic\r\n";
    result = nrf_mesh_serial_tx(hello, sizeof(hello));
    __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "Send result hello: %d\r\n", result);
    while (true)
    {
        (void)nrf_mesh_process();
    }
}

It worked fine. I can see the Hello text on UART (115200 bps) If I send a application command (opcode start from 0x20) : 0x01 0x20 , I can see RX call back is triggered and text is printed out on RTT.

Note that you need to use the format of the packet we have, first byte is length, next is opcode and then payload. The opcode have to be inside the application opcode range I mentioned above.