TTN does not forward JSON packet(s)

[petergullberg]

Hi,
I struggled half-a-day to understand why the protocol didn't work, result is that I think I have found a defect.

_txRx.ino line 657
657: ftoa((double)freqs[gwayConfig.ch].upFreq / 1000000, cfreq, 6); // XXX This can be done better

ftao generates "868.099975"....
This value is rejected TTN, and thus not forwarded...

Unclear if it's only ESP32, haven't spent more time on it...

\P

[dennisheitmann]

Use this instead of old line 657: __freqToCharMhz(freqs[gwayConfig.ch].upFreq, cfreq);
with an additional function (place e.g. in _utils.ino):

// ============== NUMBER FUNCTIONS ============================================

// ----------------------------------------------------------------------------
// Convert the given LoRa frequency, in Hz, to Mhz in a string
// It does not use float conversion, as float isnt accurate.
// Parameters:
//  freq is the freq to convert, from 100000000 to 999999999 Hz
//  *out is the strinf buffer, minimum 11 chars.
// ----------------------------------------------------------------------------
void __freqToCharMhz(uint32_t freq, char *out) {
  itoa(freq, out, 10);
  for (int i = 10; i > 2; i--){
    out[i] = out[i-1];
  }
  out[3] = '.';
}

[petergullberg]

ok...