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l2cap: limit remote MTU by local tx configuration in ERTM

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This commit is contained in:
Matthias Ringwald 2021-12-20 12:53:42 +01:00
parent 2cb53b6636
commit c54378f194
2 changed files with 8 additions and 0 deletions
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1
CHANGELOG.md
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@ -16,6 +16,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
### Fixed
- pbap_client: support disconnect while operation is ongoing
- L2CAP: limit remote MTU by local tx configuration in ERTM
### Changed
- Example: init SM if LE supported to avoid issue with Android Cross-Transport Key-Derivation

7
src/l2cap.c
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@ -3169,6 +3169,13 @@ static void l2cap_signaling_handle_configure_request(l2cap_channel_t *channel, u
channel->remote_retransmission_timeout_ms = little_endian_read_16(command, pos + 3);
channel->remote_monitor_timeout_ms = little_endian_read_16(command, pos + 5);
channel->remote_mps = little_endian_read_16(command, pos + 7);
{
// limit remote mtu by our tx buffers. Include 2 bytes SDU Length
uint16_t effective_mps = btstack_min(channel->local_mps, channel->remote_mps);
uint16_t effective_num_buffers = btstack_min(channel->remote_tx_window_size, channel->num_tx_buffers);
uint16_t effective_mtu = effective_mps * effective_num_buffers - 2;
channel->remote_mtu = btstack_min( effective_mtu, channel->remote_mtu);
}
log_info("FC&C config: tx window: %u, max transmit %u, retrans timeout %u, monitor timeout %u, mps %u",
channel->remote_tx_window_size,
channel->remote_max_transmit,