Another Payload Decoder Question (issues converting bytes to float)

Application Development
7
  1. You probably don’t need 32bits (4bytes) precision but 24 bits (3 bytes). So, you can send 2 bytes less.

In my case it seems ok this:

// https://github.com/ricaun/esp32-ttnmapper-gps/blob/8d37aa60e96707303ae07ca30366d2982e15b286/esp32-ttnmapper-gps/lmic_Payload.ino#L21
          // accuracy till 5-6 decimal
          lat = ((fix.latitude() + 90) / 180) * 16777215;
          lon = ((fix.longitude() + 180) / 360) * 16777215;
            
            loraData[0]  = lat >> 16;      // MSB
            loraData[1]  = lat >> 8;
            loraData[2]  = lat;            // LSB

            loraData[3]  = lon >> 16;
            loraData[4]  = lon >> 8;
            loraData[5] = lon;

On decoder (js) TTN V2

decoded.latitude  = +((bytes[0] << 16 | bytes[1] << 8 | bytes[2]) / 16777215.0 * 180.0 - 90).toFixed(6);
decoded.longitude = +((bytes[3] << 16 | bytes[4] << 8 | bytes[5]) / 16777215.0 * 360.0 - 180).toFixed(6);

Thanks to: How to send float value and convert it into bytes - #8 by arjanvanb