Longitude mismatch from actual long while decoding lora message

Devices
1

I have the following bytes which is received from lora gps tracker,

hex_value = 010000263032efbfbdefbfbd42efbfbd
hex_byte1 = 01
hex_byte2 = 00
hex_byte3 = 00
hex_byte4 = 26
hex_byte5 = 30
hex_byte6 = 32
hex_byte7 = ef
hex_byte8 = bf
hex_byte9 = bd
hex byte10 = ef

def parser(payload):
    val = 0
    for index in range(len(payload)):
        val += payload[index]
        if (index < len(payload) - 1):
            val = val << 8
    # print(val)
    if (val > 0x7FFFFF):
        lng_val = - (0x01000000 - val) * 180 / 0x800000
    else:
        lng_val = (val) * 180 / 0x7FFFFF
    return lng_val

byteArrayLNG = [0xbf, 0xbd, 0xef]
lng = parser(byteArrayLNG)
print("long :: ", lng)

The value which I am getting is -90.36291360855103 whereas the actual longitude is -117.4588

2

Hi Mahamutha,

I do not know the LoRa GPS tracker, but maybe there is a format error.
For example, the Adeunis field test device transmits its GPS coordinates in degrees and decimal minutes. From there the coordinates have to be converted into degrees and decimal degrees.

BR / DeHi