/**
* @brief Request emission of L2CAP_EVENT_CAN_SEND_NOW as soon as possible for server
* @note L2CAP_EVENT_CAN_SEND_NOW might be emitted during call to this function
* so packet handler should be ready to handle it
* @param con_handle
*/
void att_dispatch_server_request_can_send_now_event(hci_con_handle_t con_handle){
subscriptions[ATT_SERVER].waiting_for_can_send = 1;
if (!can_send_now_pending){
can_send_now_pending = 1;
l2cap_request_can_send_fix_channel_now_event(con_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL);
}
}
static void att_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size){
uint8_t index;
uint8_t i;
switch (packet_type){
case ATT_DATA_PACKET:
// odd PDUs are sent from server to client - even PDUs are sent from client to server
index = packet[0] & 1;
// log_info("att_data_packet with opcode 0x%x", packet[0]);
if (!subscriptions[index].packet_handler) return;
subscriptions[index].packet_handler(packet_type, handle, packet, size);
break;
case HCI_EVENT_PACKET:
if (packet[0] != L2CAP_EVENT_CAN_SEND_NOW) break;
can_send_now_pending = 0;
for (i = 0; i < ATT_MAX; i++){
index = (att_round_robin + i) & 1;
if (subscriptions[index].packet_handler && subscriptions[index].waiting_for_can_send){
subscriptions[index].waiting_for_can_send = 0;
subscriptions[index].packet_handler(packet_type, handle, packet, size);
// fairness: prioritize next service
att_round_robin = (index + 1) % ATT_MAX;
// stop if client cannot send anymore
if (!hci_can_send_acl_le_packet_now()) break;
}
}
// check if more can send now events are needed
if (!can_send_now_pending){
for (i = 0; i < ATT_MAX; i++){
if (subscriptions[i].packet_handler && subscriptions[i].waiting_for_can_send){
can_send_now_pending = 1;
// note: con_handle is not used, so we can pass in anything
l2cap_request_can_send_fix_channel_now_event(0, L2CAP_CID_ATTRIBUTE_PROTOCOL);
break;
}
}
}
break;
default:
break;
}
}
/**
* @brief Request emission of L2CAP_EVENT_CAN_SEND_NOW as soon as possible for server
* @note L2CAP_EVENT_CAN_SEND_NOW might be emitted during call to this function
* so packet handler should be ready to handle it
* @param con_handle
*/
void att_dispatch_server_request_can_send_now_event(hci_con_handle_t con_handle){
att_server_waiting_for_can_send = 1;
l2cap_request_can_send_fix_channel_now_event(con_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL);
}
