[GitHub] [incubator-nuttx] xiaoxiang781216 commented on pull request #2720: board/sim: Support NuttX BLE stack through uart shim driver

[GitBox <gi...@apache.org>]

xiaoxiang781216 commented on pull request #2720:
URL: https://github.com/apache/incubator-nuttx/pull/2720#issuecomment-762835680


   > I'm not entirely convinced that the serial interface is better than the socket interface. I also don't really see much benefit of replacing it with something that involves more layers in between.
   
   The packet transfered by socket is actually H4(UART) packet:
   https://github.com/apache/incubator-nuttx/pull/2720/files#diff-cca4f6c2d4ffd2eac608b4ae978781ae34f011e20a4bab939ade11d7ca38dc3aL97-L116
   https://github.com/apache/incubator-nuttx/pull/2720/files#diff-cca4f6c2d4ffd2eac608b4ae978781ae34f011e20a4bab939ade11d7ca38dc3aL218-L237
   So it is more natural and correct to expose it through bt_uart driver and then reuse the same packet/unpacket logic for us:
   https://github.com/apache/incubator-nuttx/blob/master/drivers/wireless/bluetooth/bt_uart.c#L209-L222
   https://github.com/apache/incubator-nuttx/blob/master/drivers/wireless/bluetooth/bt_uart.c#L315-L332
   
   > I'm curious what is the benefit you see on the tty interface over the socket based one.
   
   we can support both NuttX BLE stack and external BT/BLE stack with the same tty driver:
   
   1. NuttX BLE stack talk with the uart shim driver
   2. External BT/BLE stack talk with the tty driver
   
   More important, we can create a tty bridge driver to support BT and BLE stack from the different provider:
   
   1. Without modifyingthe hardware driver
   2. Without modifying the BT or BLE stack too
   
   like this:
   ```
   /dev/ttyHCI-BT bridge-+-/dev/ttyBT---Android bluedroid
                         |-/dev/ttyBLE--NuttX native stack
   ```
   


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