1 // Copyright 2024 The Pigweed Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not 4 // use this file except in compliance with the License. You may obtain a copy of 5 // the License at 6 // 7 // https://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the 12 // License for the specific language governing permissions and limitations under 13 // the License. 14 15 #pragma once 16 17 #include "pw_bluetooth_proxy/internal/l2cap_read_channel.h" 18 #include "pw_bluetooth_proxy/internal/l2cap_write_channel.h" 19 20 namespace pw::bluetooth::proxy { 21 22 class BasicL2capChannel : public L2capReadChannel, public L2capWriteChannel { 23 public: 24 // TODO: https://pwbug.dev/360929142 - Take the MTU. Signaling channels would 25 // provide MTU_SIG. 26 static pw::Result<BasicL2capChannel> Create( 27 L2capChannelManager& l2cap_channel_manager, 28 uint16_t connection_handle, 29 uint16_t local_cid, 30 uint16_t remote_cid, 31 pw::Function<void(pw::span<uint8_t> payload)>&& 32 payload_from_controller_fn); 33 34 BasicL2capChannel(const BasicL2capChannel& other) = delete; 35 BasicL2capChannel& operator=(const BasicL2capChannel& other) = delete; 36 BasicL2capChannel(BasicL2capChannel&&) = default; 37 // Move assignment operator allows channels to be erased from pw_containers. 38 BasicL2capChannel& operator=(BasicL2capChannel&& other) = default; 39 40 /// Send an L2CAP payload to the remote peer. 41 /// 42 /// @param[in] payload The L2CAP payload to be sent. Payload will be copied 43 /// before function completes. 44 /// 45 /// @returns @rst 46 /// 47 /// .. pw-status-codes:: 48 /// OK: If packet was successfully queued for send. 49 /// UNAVAILABLE: If channel could not acquire the resources to queue 50 /// the send at this time (transient error). 51 /// INVALID_ARGUMENT: If payload is too large. 52 /// @endrst 53 pw::Status Write(pw::span<const uint8_t> payload); 54 55 protected: 56 explicit BasicL2capChannel(L2capChannelManager& l2cap_channel_manager, 57 uint16_t connection_handle, 58 uint16_t local_cid, 59 uint16_t remote_cid, 60 pw::Function<void(pw::span<uint8_t> payload)>&& 61 payload_from_controller_fn); 62 63 protected: 64 bool HandlePduFromController(pw::span<uint8_t> bframe) override; 65 bool HandlePduFromHost(pw::span<uint8_t> bframe) override; 66 67 // TODO: https://pwbug.dev/360929142 - Stop channel on errors. 68 }; 69 70 } // namespace pw::bluetooth::proxy 71