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implemented rfcomm_max_frame_size_for_l2cap_mtu

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matthias.ringwald 2011-07-30 17:47:51 +00:00
parent ca98bc61ab
commit 300150f243
1 changed files with 16 additions and 4 deletions
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20
src/rfcomm.c
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@ -184,15 +184,27 @@ static void rfcomm_emit_service_registered(void *connection, uint8_t status, uin
// MARK: RFCOMM MULTIPLEXER HELPER
static uint16_t rfcomm_max_frame_size_for_l2cap_mtu(uint16_t l2cap_mtu){
// Assume RFCOMM header with credits and single byte length field
uint16_t max_frame_size = l2cap_mtu - 5;
// single byte can denote len up to 127
if (max_frame_size > 127) {
max_frame_size--;
}
return max_frame_size;
}
static void rfcomm_multiplexer_initialize(rfcomm_multiplexer_t *multiplexer){
bzero(multiplexer, sizeof(rfcomm_multiplexer_t));
multiplexer->state = RFCOMM_MULTIPLEXER_CLOSED;
multiplexer->l2cap_credits = 0;
multiplexer->send_dm_for_dlci = 0;
// - 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->max_frame_size = l2cap_max_mtu() - 6; // max
multiplexer->max_frame_size = rfcomm_max_frame_size_for_l2cap_mtu(l2cap_max_mtu());
}
static rfcomm_multiplexer_t * rfcomm_multiplexer_create_for_addr(bd_addr_t *addr){