syntax = "proto3";

package tunnel;

option go_package = "relay/proto/tunnel;tunnelpb";
option java_package = "com.projects.httpsserverapp.tunnel.v1";
option java_multiple_files = true;

service TunnelService {
  rpc Tunnel(stream Frame) returns (stream Frame);
}

enum FrameType {
  FRAME_UNSPECIFIED = 0;

  FRAME_OPEN   = 1; // открыть TCP stream
  FRAME_DATA   = 2;
  FRAME_CLOSE  = 3;

  FRAME_PING   = 4;
  FRAME_PONG   = 5;

  FRAME_BIND_REQUEST  = 10; // device → relay
  FRAME_BIND_OK       = 11; // relay → device
  FRAME_BIND_REJECTED = 12; // relay → device
}

message Frame {
  FrameType type = 1;
  uint32 stream_id = 2;
  bytes payload = 3;
}