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respect local l2cap MTU

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This commit is contained in:
matthias.ringwald 2011-06-12 12:33:31 +00:00
parent 4c98aa43c7
commit cedcb0e3de
1 changed files with 13 additions and 4 deletions
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15
src/rfcomm.c
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@ -152,6 +152,8 @@ typedef struct {
// hack to deal with authentication failure only observed by remote side // hack to deal with authentication failure only observed by remote side
uint8_t at_least_one_connection; uint8_t at_least_one_connection;
uint16_t max_frame_size;
} rfcomm_multiplexer_t; } rfcomm_multiplexer_t;
// info regarding an actual coneection // info regarding an actual coneection
@ -281,7 +283,8 @@ static void rfcomm_channel_initialize(rfcomm_channel_t *channel, rfcomm_multiple
channel->multiplexer = multiplexer; channel->multiplexer = multiplexer;
channel->service = service; channel->service = service;
channel->rfcomm_cid = rfcomm_client_cid_generator++; channel->rfcomm_cid = rfcomm_client_cid_generator++;
channel->max_frame_size = RFCOMM_DEFAULT_FRAME_SIZE; // us channel->max_frame_size = multiplexer->max_frame_size;
channel->credits_incoming = 0; channel->credits_incoming = 0;
channel->credits_outgoing = 0; channel->credits_outgoing = 0;
channel->packets_granted = 0; channel->packets_granted = 0;
@ -731,10 +734,13 @@ static int rfcomm_multiplexer_hci_event_handler(uint8_t *packet, uint16_t size){
} }
log_dbg("L2CAP_EVENT_CHANNEL_OPENED: create incoming multiplexer for channel %02x\n", l2cap_cid); log_dbg("L2CAP_EVENT_CHANNEL_OPENED: create incoming multiplexer for channel %02x\n", l2cap_cid);
// create and inititialize new multiplexer instance (incoming) // create and inititialize new multiplexer instance (incoming)
// - Max RFCOMM header has 6 bytes (P/F bit is set, payload length >= 128)
// - therefore, we set RFCOMM max frame size <= Local L2CAP MTU - 6
multiplexer = rfcomm_multiplexer_create_for_addr(&event_addr); multiplexer = rfcomm_multiplexer_create_for_addr(&event_addr);
multiplexer->con_handle = con_handle; multiplexer->con_handle = con_handle;
multiplexer->l2cap_cid = l2cap_cid; multiplexer->l2cap_cid = l2cap_cid;
multiplexer->state = RFCOMM_MULTIPLEXER_W4_SABM_0; multiplexer->state = RFCOMM_MULTIPLEXER_W4_SABM_0;
multiplexer->max_frame_size = READ_BT_16(packet, 17) - 6;
return 1; return 1;
// l2cap disconnect -> state = RFCOMM_MULTIPLEXER_CLOSED; // l2cap disconnect -> state = RFCOMM_MULTIPLEXER_CLOSED;
@ -1034,6 +1040,9 @@ void rfcomm_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packe
// priority of client request // priority of client request
rfChannel->pn_priority = packet[payload_offset+4]; rfChannel->pn_priority = packet[payload_offset+4];
// negotiate max frame size // negotiate max frame size
if (rfChannel->max_frame_size > multiplexer->max_frame_size) {
rfChannel->max_frame_size = multiplexer->max_frame_size;
}
if (rfChannel->max_frame_size > max_frame_size) { if (rfChannel->max_frame_size > max_frame_size) {
rfChannel->max_frame_size = max_frame_size; rfChannel->max_frame_size = max_frame_size;
} }
@ -1246,10 +1255,10 @@ void rfcomm_close_connection(void *connection){
it = it->next; it = it->next;
} }
} }
}
#pragma mark RFCOMM BTstack API #pragma mark RFCOMM BTstack API
//#pragma mark RFCOMM BTstack API
void rfcomm_init(void){ void rfcomm_init(void){
rfcomm_client_cid_generator = 0; rfcomm_client_cid_generator = 0;
rfcomm_multiplexers = NULL; rfcomm_multiplexers = NULL;