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l2cap-ertm: assert that packet can be stored in fragment buffers in ertm

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This commit is contained in:
Matthias Ringwald 2019-09-20 15:26:41 +02:00
parent b5858f2df2
commit 2e4c1850fc
2 changed files with 13 additions and 0 deletions
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1
CHANGELOG.md
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@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
## [Unreleased]
### Fixed
- L2CAP ERTM: assert that packet can be stored in fragment buffers in ertm
### Added
- GAP: allow to reject GAP classic connection via gap_register_classic_connection_filter

12
src/l2cap.c
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@ -2700,6 +2700,18 @@ static void l2cap_signaling_handler_channel(l2cap_channel_t *channel, uint8_t *c
break;
}
if (l2cap_channel_ready_for_open(channel)){
#ifdef ENABLE_L2CAP_ENHANCED_RETRANSMISSION_MODE
// assert that packet can be stored in fragment buffers in ertm
if (channel->mode == L2CAP_CHANNEL_MODE_ENHANCED_RETRANSMISSION){
uint16_t effective_mps = btstack_min(channel->remote_mps, channel->local_mps);
uint16_t usable_mtu = channel->num_tx_buffers == 1 ? effective_mps : channel->num_tx_buffers * effective_mps - 2;
if (usable_mtu < channel->remote_mtu){
log_info("Remote MTU %u > max storable ERTM packet, only using MTU = %u", channel->remote_mtu, usable_mtu);
channel->remote_mtu = usable_mtu;
}
}
#endif
// for open:
channel->state = L2CAP_STATE_OPEN;
l2cap_emit_channel_opened(channel, 0);