[GitHub] [incubator-nuttx] xiaoxiang781216 commented on pull request #3543: feat(esp32c3): Support esp32c3 ble function

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xiaoxiang781216 commented on pull request #3543:
URL: https://github.com/apache/incubator-nuttx/pull/3543#issuecomment-828249440


   Exposing bt_driver_s directly has some limitation at this stage:
   
   1. NuttX just support BLE stack, but many SoC support BT and BLE, we need provide a solution for combo device.
   2. NuttX doesn't have a full feature BLE userspace stack(something like bluez), it waste flash/memory to integrate other monolithic bluetooth stack(e.g. nimBLE) through the raw socket because:
      a. All L2 layer code duplicate in kernel(wireless/bluetooth) and uerspace(e.g. nimBLE)
      b. BLE only SoC has to bring in the unnecessary network infrastructure code(socket/bind/send/recv...)
   3. Expose BT/BLE through tty driver interface, chip vendor can support all cases with one driver implementation:
      a. nimBLE/bluedriod/btstack can work with /dev/tty directly, we don't need provide any wrapper at all.
      b. With NuttX's bt_uart_shim driver, we can support NuttX BLE stack without any additional code.
   
   From the architecture perspective, the best way is to implement/port bluez(profile only) liked stack to NuttX. All other monolithic stack support(nimBLE/bluedriod/btstack) should be dropped to promote the best architecture.


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