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def checksum(nmea_data, type_msg): nmea_data = nmea_data.strip() start_index = nmea_data.find('$') + 1 end_index = nmea_data.find('*') checksum_str = nmea_data[start_index:end_index] get_checksum = nmea_data[-2:] # Calculate XOR checksum checksum = 0 for char in checksum_str: checksum ^= ord(char) # Convert checksum to hexadecimal checksum_hex = hex(checksum)[2:].upper().zfill(2) # Append checksum to NMEA data nmea_data_with_checksum = f"{nmea_data}${checksum_hex}"