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att_server: implement round robin for server request, notifications, and indications

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This commit is contained in:
Matthias Ringwald 2018-05-22 17:29:24 +02:00
parent f29a88d8db
commit 6438547a10
1 changed files with 31 additions and 9 deletions
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40
src/ble/att_server.c
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@ -102,9 +102,8 @@ static btstack_context_callback_registration_t att_client_waiting_for_can_send_r
static att_read_callback_t att_server_client_read_callback;
static att_write_callback_t att_server_client_write_callback;
// track CCC 1-entry cache
// static att_server_t * att_persistent_ccc_server;
// static hci_con_handle_t att_persistent_ccc_con_handle;
// round robin
static hci_con_handle_t att_server_last_can_send_now = HCI_CON_HANDLE_INVALID;
static att_server_t * att_server_for_handle(hci_con_handle_t con_handle){
hci_connection_t * hci_connection = hci_connection_for_handle(con_handle);
@ -511,26 +510,42 @@ static void att_server_trigger_send_for_phase(att_server_t * att_server, att_se
static void att_server_handle_can_send_now(void){
// NOTE: we get l2cap fixed channel instead of con_handle
hci_con_handle_t request_con_handle = HCI_CON_HANDLE_INVALID;
hci_con_handle_t last_send_con_handle = HCI_CON_HANDLE_INVALID;
int can_send_now = 1;
hci_con_handle_t request_con_handle = HCI_CON_HANDLE_INVALID;
int phase;
for (phase = ATT_SERVER_RUN_PHASE_1_REQUESTS; phase <= ATT_SERVER_RUN_PHASE_3_NOTIFICATIONS; phase++){
btstack_linked_list_iterator_t it;
hci_con_handle_t skip_connections_until = att_server_last_can_send_now;
while (1){
btstack_linked_list_iterator_t it;
hci_connections_get_iterator(&it);
while(btstack_linked_list_iterator_has_next(&it)){
hci_connection_t * connection = (hci_connection_t *) btstack_linked_list_iterator_next(&it);
att_server_t * att_server = &connection->att_server;
int data_ready = att_server_data_ready_for_phase(att_server, phase);
// log_debug("phase %u, handle 0x%04x, skip until 0x%04x, data ready %u", phase, att_server->connection.con_handle, skip_connections_until, data_ready);
// skip until last sender found (which is also skipped)
if (skip_connections_until != HCI_CON_HANDLE_INVALID){
if (data_ready && request_con_handle == HCI_CON_HANDLE_INVALID){
request_con_handle = att_server->connection.con_handle;
}
if (skip_connections_until == att_server->connection.con_handle){
skip_connections_until = HCI_CON_HANDLE_INVALID;
}
continue;
};
if (data_ready){
if (can_send_now){
att_server_trigger_send_for_phase(att_server, phase);
last_send_con_handle = att_server->connection.con_handle;
can_send_now = att_dispatch_server_can_send_now(att_server->connection.con_handle);
data_ready = att_server_data_ready_for_phase(att_server, phase);
if (request_con_handle == HCI_CON_HANDLE_INVALID && data_ready){
if (data_ready && request_con_handle == HCI_CON_HANDLE_INVALID){
request_con_handle = att_server->connection.con_handle;
}
} else {
@ -540,6 +555,9 @@ static void att_server_handle_can_send_now(void){
}
}
// stop skipping (handles disconnect by last send connection)
skip_connections_until = HCI_CON_HANDLE_INVALID;
// Exit loop, if we cannot send
if (!can_send_now) break;
@ -549,6 +567,10 @@ static void att_server_handle_can_send_now(void){
// Finally, if we still can send and there are requests, just try again
request_con_handle = HCI_CON_HANDLE_INVALID;
}
// update last send con handle for round robin
if (last_send_con_handle != HCI_CON_HANDLE_INVALID){
att_server_last_can_send_now = last_send_con_handle;
}
}
if (request_con_handle == HCI_CON_HANDLE_INVALID) return;