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l2cap-ertm: disconnect l2cap after monitor timeout and rety count has reached max transmit

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This commit is contained in:
Matthias Ringwald 2017-07-18 11:12:44 +02:00
parent 20fa474d9d
commit db55d2e9b3
3 changed files with 50 additions and 16 deletions
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58
src/l2cap.c
View File

@ -569,16 +569,52 @@ static void l2cap_ertm_next_tx_write_index(l2cap_channel_t * channel){
if (channel->tx_write_index < channel->num_tx_buffers) return;
channel->tx_write_index = 0;
}
static void l2cap_ertm_retransmission_timeout_callback(btstack_timer_source_t * ts){
log_info("l2cap_ertm_retransmission_timeout_callback");
l2cap_channel_t * channel = (l2cap_channel_t *) btstack_run_loop_get_timer_context(ts);
channel->send_supervisor_frame_receiver_ready_poll = 1;
l2cap_run();
}
static void l2cap_ertm_monitor_timeout_callback(btstack_timer_source_t * ts){
log_info("l2cap_ertm_monitor_timeout_callback");
l2cap_channel_t * channel = (l2cap_channel_t *) btstack_run_loop_get_timer_context(ts);
channel->send_supervisor_frame_receiver_ready_poll = 1;
l2cap_channel_t * l2cap_channel = (l2cap_channel_t *) btstack_run_loop_get_timer_context(ts);
// TODO: we assume that it's the oldest packet
l2cap_ertm_tx_packet_state_t * tx_state;
tx_state = &l2cap_channel->tx_packets_state[l2cap_channel->tx_read_index];
// check retry count
if (tx_state->retry_count < l2cap_channel->remote_max_transmit){
// increment retry count
tx_state->retry_count++;
// start monitor timer
btstack_run_loop_set_timer_handler(&tx_state->monitor_timer, &l2cap_ertm_monitor_timeout_callback);
btstack_run_loop_set_timer_context(&tx_state->monitor_timer, l2cap_channel);
btstack_run_loop_set_timer(&tx_state->monitor_timer, l2cap_channel->local_monitor_timeout_ms);
btstack_run_loop_add_timer(&tx_state->monitor_timer);
// send RR/P=1
l2cap_channel->send_supervisor_frame_receiver_ready_poll = 1;
} else {
log_info("Monitor timer expired & retry count >= max transmit -> disconnect");
l2cap_channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST;
}
l2cap_run();
}
static void l2cap_ertm_retransmission_timeout_callback(btstack_timer_source_t * ts){
log_info("l2cap_ertm_retransmission_timeout_callback");
l2cap_channel_t * l2cap_channel = (l2cap_channel_t *) btstack_run_loop_get_timer_context(ts);
// TODO: we assume that it's the oldest packet
l2cap_ertm_tx_packet_state_t * tx_state;
tx_state = &l2cap_channel->tx_packets_state[l2cap_channel->tx_read_index];
// set retry count = 1
tx_state->retry_count = 1;
// start monitor timer
btstack_run_loop_set_timer_handler(&tx_state->monitor_timer, &l2cap_ertm_monitor_timeout_callback);
btstack_run_loop_set_timer_context(&tx_state->monitor_timer, l2cap_channel);
btstack_run_loop_set_timer(&tx_state->monitor_timer, l2cap_channel->local_monitor_timeout_ms);
btstack_run_loop_add_timer(&tx_state->monitor_timer);
// send RR/P=1
l2cap_channel->send_supervisor_frame_receiver_ready_poll = 1;
l2cap_run();
}
static int l2cap_ertm_send_information_frame(l2cap_channel_t * channel, int index){
@ -603,6 +639,7 @@ static int l2cap_ertm_send(l2cap_channel_t * channel, uint8_t * data, uint16_t l
l2cap_ertm_tx_packet_state_t * tx_state = &channel->tx_packets_state[index];
tx_state->tx_seq = channel->next_tx_seq;
tx_state->len = len;
tx_state->retry_count = 0;
memcpy(&channel->tx_packets_data[index * channel->local_mtu], data, len);
// update
channel->next_tx_seq = l2cap_next_ertm_seq_nr(channel->next_tx_seq);
@ -612,11 +649,6 @@ static int l2cap_ertm_send(l2cap_channel_t * channel, uint8_t * data, uint16_t l
btstack_run_loop_set_timer_context(&tx_state->retransmission_timer, channel);
btstack_run_loop_set_timer(&tx_state->retransmission_timer, channel->local_retransmission_timeout_ms);
btstack_run_loop_add_timer(&tx_state->retransmission_timer);
// set monitor timer
btstack_run_loop_set_timer_handler(&tx_state->monitor_timer, &l2cap_ertm_monitor_timeout_callback);
btstack_run_loop_set_timer_context(&tx_state->monitor_timer, channel);
btstack_run_loop_set_timer(&tx_state->monitor_timer, channel->local_monitor_timeout_ms);
btstack_run_loop_add_timer(&tx_state->monitor_timer);
// try to send
l2cap_run();
return 0;

3
src/l2cap.h
View File

@ -124,8 +124,9 @@ typedef struct {
typedef struct {
btstack_timer_source_t retransmission_timer;
btstack_timer_source_t monitor_timer;
uint8_t tx_seq;
uint16_t len;
uint8_t tx_seq;
uint8_t retry_count;
} l2cap_ertm_tx_packet_state_t;

5
test/pts/l2cap_test.c
View File

@ -69,6 +69,7 @@ static uint16_t handle;
static uint16_t local_cid;
static int l2cap_ertm;
static int l2cap_ertm_mandatory;
static int l2cap_max_transmit = 2; // some tests require > 1
static btstack_packet_callback_registration_t hci_event_callback_registration;
static uint8_t ertm_buffer[10000];
@ -113,7 +114,7 @@ static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *pack
uint16_t l2cap_cid = little_endian_read_16(packet, 12);
if (l2cap_ertm){
printf("L2CAP Accepting incoming connection request in ERTM\n");
l2cap_accept_ertm_connection(l2cap_cid, l2cap_ertm_mandatory, 1, 2000, 12000, 4, 4, ertm_buffer, sizeof(ertm_buffer));
l2cap_accept_ertm_connection(l2cap_cid, l2cap_ertm_mandatory, l2cap_max_transmit, 2000, 12000, 4, 4, ertm_buffer, sizeof(ertm_buffer));
} else {
printf("L2CAP Accepting incoming connection request in Basic Mode\n");
l2cap_accept_connection(l2cap_cid);
@ -156,7 +157,7 @@ static void stdin_process(char buffer){
case 'c':
printf("Creating L2CAP Connection to %s, PSM SDP\n", bd_addr_to_str(remote));
if (l2cap_ertm){
l2cap_create_ertm_channel(packet_handler, remote, BLUETOOTH_PROTOCOL_SDP, l2cap_ertm_mandatory, 1, 2000, 12000, 4, 4, ertm_buffer, sizeof(ertm_buffer), &local_cid);
l2cap_create_ertm_channel(packet_handler, remote, BLUETOOTH_PROTOCOL_SDP, l2cap_ertm_mandatory, l2cap_max_transmit, 2000, 12000, 4, 4, ertm_buffer, sizeof(ertm_buffer), &local_cid);
} else {
l2cap_create_channel(packet_handler, remote, BLUETOOTH_PROTOCOL_SDP, 100, &local_cid);
}