LoRaSerial Hookup Guide
The following table shows the relationship between the AirSpeed setting and the resulting LoRa specific bandwidth, spread factor, and coding rates. In general, it is recommended that users use AirSpeed and to not use custom bandwidths, spread factors, or coding rates as this may lead to out-of-compliance setups.
The bandwidth, spread, and coding rates were chosen to get close to an ‘equivalent’ commonly used baud rate. However this is not absolute. An airspeed of 4800 bits per second is default but as can be seen in the table, the actual max bytes per second is approximately 510 best case scenario.