Particle sensor interface with BLE

[VelMurugan]

HI ,

I need to interface particle measurement sensor with nrf52832. I am using S132 softdevice and SDK 11.0 for my application. I need to send commands to sensor to take action(like auto send,auto stop,read particle, set adjustment,get adjustment...). And I need to send those datas to mobile app via BLE through notification mode.I can able to send commands and get response from sensor. I cannot able to send commands to uart when i am in "void on_write(ble_lbs_t * p_lbs, ble_evt_t * p_ble_evt)" this event. Can anyone guide me to implement.

[Sigurd]

Hi,

So if I understand you correctly, you are using the LED Button Service for sending these action-commands from the phone to the nRF52832. And when you receive these commands over BLE on the nRF52832, you want the nRF52832 to send some data over UART to the particle measurement sensor ?

[VelMurugan]

Hi Sigurd, You are correct. I am using LED Button service.

[Sigurd]

Ok, then it would be easiest to implement this functionality in the led_write_handler() function. You can find the function in main.c. This is a function for handling write events to the LED characteristic. You can see this function being called in the on_write() function like this:

if ((p_evt_write->handle == p_lbs->led_char_handles.value_handle) &&
    (p_evt_write->len == 1) &&
    (p_lbs->led_write_handler != NULL))
{
    p_lbs->led_write_handler(p_ble_evt->evt.gap_evt.conn_handle, p_lbs, p_evt_write->data[0]);
}

Then in the led_write_handler() you can use the uint8_t led_state indicate what commands you want to send, using a switch-case. A start could be something like this:

static void led_write_handler(uint16_t conn_handle, ble_lbs_t * p_lbs, uint8_t led_state)
{
    switch (led_state)
    {
        case AUTO_SEND:
            
            break;
        
        case AUTO_STOP:
            
            break;        

        default:
            
            break;
    }
}

For each switch-statement you can send data over the uart using the app_uart_put() function.

[VelMurugan]

Thanks Sigurd.... I will try your suggestion....