patacongo edited a comment on pull request #1661:
URL: https://github.com/apache/incubator-nuttx/pull/1661#issuecomment-690773190
> bluetooth_send -> bluetooth_l2cap_send -> psock_bluetooth_sendto -> netdev
TX queue (bluetooth_sendto_eventhandler) -> radio->r_req_data (btnet_req_data)
-> bt_l2cap_send -> bt_conn_send
>
> whereas the ATT layer calls directly into `bt_l2cap_send`.
You cannot call bt_l2cap_send() directory, the network design requires that
you notify the network device and wait for a TX poll event. This part of the
logic must be common to all TX actions:
bluetooth_send -> bluetooth_l2cap_send -> psock_bluetooth_sendto ->
netdev TX queue (bluetooth_sendto_eventhandler)
The just gets the packet to the bluetooth network driver. The following
logic then just gets the packet from the network driver to the radio driver:
radio->r_req_data (btnet_req_data)
Which just calls bt_l2cap_send(). That is the absolute shortest path do do
that. But I don't understand. That is the absolute shortest patch and just
calls bt_l2cap_send(). There is no shorter way to get get there. You CANNOT
call bt_l2cap_send() directly.
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