Hi,
I am using an NRF 51 DK, SDK 12.3, and Soft Device S130. I am also a beginner to development with Nordic Products, and RSSI collection in general. I am using the ble_peripheral -> ble_app_uart example as a foundation to slowly build upon more and more. Currently, my goal with what I have written is: to send a command via the UART section of the nRF ToolBox app, and print the RSSI value at that given moment on the terminal.
The problem I face, is that no matter what I do, the value that returns is always the same (-112) no matter what I do, as you'll see in my screenshots below. I understand the inconsistency of RSSI, however there should be at the very least some variation. What am I doing wrong?
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static void nus_data_handler( ble_nus_t * p_nus, uint8_t * p_data, uint16_t length)
{
// PROGRAMMER COMMENTS:
// 1 ) handles data received from UART app service
// 2 ) Code below represents basic BLE communication and RSSI reading
uint32_t err_code; // variable for printing error
int8_t p_rssi; //Pointer to location where RSSI measurement will be stored
if (p_data[0] == 'r') { //If first character is 'r'
err_code = sd_ble_gap_rssi_start( m_conn_handle, 1 , 1 );
if ( err_code != NRF_SUCCESS ) { // If RSSI fails to start scanning
printf("Error code: %d\n", err_code);
uint8_t data_array[12] = {'a', ' ', 'p', 'r', 'o', 'b', 'l', 'e', 'm', '!', '\n'};
uint8_t length_of_data = 12;
err_code = ble_nus_string_send(&m_nus, data_array, length_of_data);
APP_ERROR_CHECK(err_code);
}
else {
sd_ble_gap_rssi_get( m_conn_handle, &p_rssi );
if ( p_rssi < 0 ) {
printf("Current RSSI: %d\r\n", p_rssi);
sd_ble_gap_rssi_stop( m_conn_handle);
err_code = 0; // Re-initializing both variables related to RSSI data collection
p_rssi = 0; // In the hopes of reading out a different RSSI value
uint8_t data_array[11] = {'C', 'o', 'n', 'f', 'i', 'r', 'm', 'e', 'd', '!'};
uint8_t length_of_data = 11;
err_code = ble_nus_string_send(&m_nus, data_array, length_of_data);
APP_ERROR_CHECK(err_code);
}
else { // Should not collect anything greater than 0. Considering it a bad read
printf("Error code: %d\n", err_code);
printf("Current RSSI: %d\r\n", p_rssi);
uint8_t data_array[12] = {'B', 'a', 'd', ' ', 'R', 'e', 'a', 'd', '!', '!', '\n'};
uint8_t length_of_data = 12;
err_code = ble_nus_string_send(&m_nus, data_array, length_of_data);
APP_ERROR_CHECK(err_code);
}
}
}
else { // If its not what I want (in this case 'r'), then send it back
err_code = ble_nus_string_send(&m_nus, p_data, length);
APP_ERROR_CHECK(err_code);
}
//for (uint32_t i = 0; i < length; i++)
//{
//while (app_uart_put(p_data[i]) != NRF_SUCCESS);
//}
//while (app_uart_put('\r') != NRF_SUCCESS);
//while (app_uart_put('\n') != NRF_SUCCESS);
}
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