What are the Bluetooth UART interface requirements on the Sona TI351?

Answer

The Sona TI351 UART requires RTS/CTS hardware handshaking and operates at 115200 baud. In addition, the host must immediately stop transmitting when RTS is asserted. If the host sends even one byte after RTS is asserted the firmware will hang.

If this is a problem, then the host must disable the power saving “autonomous” mode before enabling the Bluetooth interface.

echo "0" > /sys/kernel/debug/ieee80211/wlan0/cc33xx/sleep_auth