// Copyright 2022 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

syntax = "proto3";

package netsim.packet;

import "hci_packet.proto";
import "startup.proto";

/**
 * This is the packet service for the network simulator.
 *
 * Android Virtual Devices (AVDs) and accessory devices use this service to
 * connect to the network simulator and pass packets back and forth.
 *
 * AVDs running in a guest VM are built with virtual controllers for each radio
 * chip. These controllers route chip requests to host emulators (qemu and
 * crosvm) using virtio and from there they are forwarded to this gRpc service.
 *
 * This setup provides a transparent radio environment across AVDs and
 * accessories because the network simulator contains libraries to emulate
 * Bluetooth, 80211MAC, UWB, and Rtt chips.
 *
 */
service PacketStreamer {
  // Attach a virtual radio controller to the network simulation.
  rpc StreamPackets(stream PacketRequest) returns (stream PacketResponse);
}

message PacketRequest {
  // The pattern of oneof in a stream from grpc/load_balancer.proto
  oneof request_type {
    // This message should be sent on the first request to the network
    // simulator. Specifies the device name and chip type for the packet stream.
    netsim.startup.ChipInfo initial_info = 1;
    // The streamed data for an attached hci radio chip
    HCIPacket hci_packet = 2;
    // The streamed data for other radio chips
    bytes packet = 3;
  }
}

message PacketResponse {
  oneof response_type {
    // Error during streaming
    string error = 1;
    // The streamed data for an attached hci radio chip
    HCIPacket hci_packet = 2;
    // The streamed data for other radio chips
    bytes packet = 3;
  }
}