This page shows how to set baudrate (aka bitrate) on BlueSnap M6A wireless RS232 Adapter.
Connect to M6A with yACK BLE app. Android: tap STRM so it shows RCMD. iOS: Tap COMMAND. yACK BLE is now in COMMAND mode.
Set the baudrate using command ‘set ua b baudrate’ then tap SEND, then use command ‘save’, now power off/on the BlueSnap M6A and the baudrate will be changed.