syntax = "proto3";

package bluetooth.l2cap.classic;

import "google/protobuf/empty.proto";
import "facade/common.proto";

service L2capClassicModuleFacade {
  rpc FetchConnectionComplete(google.protobuf.Empty) returns (stream ConnectionCompleteEvent) {
    // Testing Android Bluetooth stack only. Optional for other stack.
  }
  rpc FetchConnectionClose(google.protobuf.Empty) returns (stream ConnectionCloseEvent) {
    // Testing Android Bluetooth stack only. Optional for other stack.
  }
  rpc OpenChannel(OpenChannelRequest) returns (google.protobuf.Empty) {}
  rpc CloseChannel(CloseChannelRequest) returns (google.protobuf.Empty) {}
  rpc FetchL2capData(google.protobuf.Empty) returns (stream L2capPacket) {}
  rpc SetDynamicChannel(SetEnableDynamicChannelRequest) returns (google.protobuf.Empty) {}
  rpc SendDynamicChannelPacket(DynamicChannelPacket) returns (google.protobuf.Empty) {}
  rpc SetTrafficPaused(SetTrafficPausedRequest) returns (google.protobuf.Empty) {}
  rpc GetChannelQueueDepth(google.protobuf.Empty) returns (GetChannelQueueDepthResponse) {
    // Get the buffer size of channel queue end for L2CAP user (how many packets we can buffer
    // before L2CAP user dequeues.
  }
}

message RegisterChannelRequest {
  uint32 channel = 1;
}

message ConnectionCompleteEvent {
  facade.BluetoothAddress remote = 1;
}

message ConnectionCloseEvent {
  facade.BluetoothAddress remote = 1;
  uint32 reason = 2;
}

enum RetransmissionFlowControlMode {
  BASIC = 0;
  ERTM = 1;
  ERTM_OPTIONAL = 2;
}

message OpenChannelRequest {
  facade.BluetoothAddress remote = 1;
  uint32 psm = 2;
  RetransmissionFlowControlMode mode = 3;
}

message CloseChannelRequest {
  uint32 psm = 1;
}

enum ChannelSignalEventType {
  OPEN = 0;
  CLOSE = 1;
  CONFIGURE = 2;
}

message ChannelSignalEvent {
  uint32 cid = 1;
  ChannelSignalEventType type = 2;
}

enum SendL2capPacketResultType {
  OK = 0;
  BAD_CID = 1;
}

message SendL2capPacketResult {
  SendL2capPacketResultType result_type = 1;
}

message L2capPacket {
  oneof channel_type {
    uint32 psm = 1;
    uint32 fixed_cid = 2;
  }
  bytes payload = 3;
}

message SetEnableDynamicChannelRequest {
  uint32 psm = 1;
  bool enable = 2;
  RetransmissionFlowControlMode retransmission_mode = 3;
}

message DynamicChannelPacket {
  facade.BluetoothAddress remote = 1;
  uint32 psm = 2;
  bytes payload = 3;
}

message SetTrafficPausedRequest {
  bool paused = 1;
  uint32 psm = 2;
}

message GetChannelQueueDepthResponse {
  uint32 size = 1;
}

enum ClassicSecurityPolicy {
  ENCRYPTED_TRANSPORT = 0;
  AUTHENTICATED_ENCRYPTED_TRANSPORT = 1;
  BEST = 2;
  _SDP_ONLY_NO_SECURITY_WHATSOEVER_PLAINTEXT_TRANSPORT_OK = 3;
}