How to retrieve Value from multiple Characteristics based Service Handler p_ble_evt-header.evt_id.?

Question

Hi, I have one service UUID ffe0 that has two characteristics: one of has UUID ffe4 use for "notify" and other one has UUID ffe5 use for "write and read". Now i want to get the data from the FFE5 and reply accordingly as per the data that I received from FFE5 suppose I write send data from mobile App to board is "SEND=1" as string to characteristic UUID FFE5 now according to the message received from the FFE5 service i.e. SEND=1 I want to reflect the characteristic UUID FFE4 as "OK" if the string matches as SEND=1. Now My main Question is How i know when the data is being received from FFE5 characteristic UUID. If I get that as an interrupt or anything I will send a reply as "OK" over the characteristic UUID FFE4. I have also created NRF_SDH_BLE_OBSERVER for that service. But how to get value from the different characteristics UUID like 0xFFE5 and so forth if any . 
 switch (p_ble_evt->header.evt_id)
 {
 case BLE_GAP_EVT_CONNECTED:
 p_our_service->conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
 break;
 case BLE_GAP_EVT_DISCONNECTED:
 p_our_service->conn_handle = BLE_CONN_HANDLE_INVALID;
 break;
 default:
 // No implementation needed.
 break;
 }
 
 Thanks in advance.

Edvin · Accepted Answer

volatile bool send_flag = false;
volatile bool more_data = false;
volatile uint8_t data_array[MAX_LENGTH];
volatile uint16_t data_length;


static void ble_evt_handler(...)
{
 ...
 case BLE_GATTS_EVT_HVN_TX_COMPLETE:
 if (more_data)
 {
 send_flag = true;
 }
 break;
}

static void nus_data_handler(ble_nus_evt_t * p_evt)
{
 ...
 if (p_evt->type == BLE_NUS_EVT_RX_DATA)
 {
 // Copy data from event to your custom data_array.
 for (uint8_t i=0; i<p_evt->....len; i++)
 {
 data_array[i] = p_evt->....data[i];
 }
 data_length = p_evt->...len;
 send_flag = true;
 more_data = true;
 }
}


int main(void)
{
 // Init everything.
 
 ...
 for(;;)
 {
 if (send_flag)
 {
 send_flag = false;
 err_code = send_data()
 if (err_code == NRF_SUCCESS)
 {
 
 more_data = false;
 }
 }
 
 idle_state_handle
 }
} 
 Something like this. Send the data from main, and only try again if the TX_COMPLETE event occurs and you have more data to send. 
 
 BR, Edvin

How to retrieve Value from multiple Characteristics based Service Handler p_ble_evt->header.evt_id.?

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