HCI support over RPTUN

[raiden00pl]

Hi, is there anyone currently working on the support of BT HCI over RPTUN ?

A question probably mainly for the Xiaomi team. I prefer to ask to avoid duplication of work before I start implementing it myself.

[xiaoxiang781216]

Hi, is there anyone currently working on the support of BT HCI over RPTUN ?

How about btuart_shim+rpmsg-uart?

A question probably mainly for the Xiaomi team. I prefer to ask to avoid duplication of work before I start implementing it myself.

Or you want to make bt_driver remote directly?

[raiden00pl]

How about btuart_shim+rpmsg-uart?

TIL: shim is a valid computer programming term :)

I didn't look at bt_uart_shim.c before but I see now this is something that may be helpful.

Or you want to make bt_driver remote directly?

I was thinking about remote bt_driver, something like HCI RPMSG in Zephyr (https://github.com/zephyrproject-rtos/zephyr/blob/main/drivers/bluetooth/hci/rpmsg.c), but for now I'll try the solution you proposed.

[xiaoxiang781216]

Both is fine, but we didn't do the Zephyr approach on NuttX yet. If you finally select Zephyr approach, I can help review your change.

[raiden00pl]

I ended up writing a Zephyr-like HCI RPMSG controller. After a dozen hardfaults and deadlocks, it seems to work. I'll prepare PR tomorrow.