Issue the M2_BTL_SET_BAUDRATE command in HCI mode.
Check the HCI M2 SET return event for errors.
A delay of 100ms is recommended in the specification to give the PAN1026 time to switch. In that time the host controller needs to reconfigure the baudrate to the desired baudrate as well.
After the delay, the communication can be continued with the new baudrate.
No special handling is necessary afterwards.