Sending number over ble with ble_nus_string_send

This kind of question seems to get asked more often than I could believe possible.

The number has been sent as a 16 bit number. It's little endian so the first byte is the lower 8 bits, the second the higher 8 bits, so the number received is ... 0x0017

which is 23 (16 + 7 == 23)

Whatever you have on the other side just needs to convert that. If you want to send it as a string instead, convert it to a string on the client and send that instead.

Since temp is a uint8_t, the pointer &temp points to a single byte with your temperature, and whatever the following byte in memory happens to be. If you want to send 2 bytes as you're doing now, declare temp to be a 16-bit integer. Also note that you'll probably get the low-order byte first because of the little-endian chip.

The temperature appers in hexadecimal, 23=17 in hexadecimal. I tried to send the temperature in a string and the result it's the same. I tried to change the type of variable but i can't because the function that gives me temperature uses that type and to change it i would have to change a lot of librarys and gives me a lot of errors. I can't neather pass from hexadecimal to int on the side of central because the value it's only in one bit. Can anyone help??

Hi JoanaBabo!

If you want to send the temperature value as a string instead,
you could try writing your code something like this:

static void nus_data_handler(ble_nus_t * p_nus, uint8_t * p_data, uint16_t length)  
{     
  if(p_data[0]=='?')
  {   

  int32_t temp;
  uint8_t data[20]; 
  uint32_t err_code;

  err_code = sd_temp_get(&temp);
  APP_ERROR_CHECK(err_code);

  temp = (temp / 4);
  sprintf((char *)data, "Temperature: %d", temp); 
  printf("Temperature: %d \n", temp);

  ble_nus_string_send(&m_nus, data, sizeof(data));
  }                                                   
}

Let me know if that doesn't work out for you.

Best regards,
Joakim.

It Worked!!!! Thank you very much!!!