syntax = "proto3";

message HelloReq {
  uint32 protocol_version = 1;
}

message HelloRsp {
  uint32 protocol_version = 1;
  uint32 vendor_id = 2;
  uint32 product_id = 3;
  uint32 firmware_major = 4;
  uint32 firmware_minor = 5;
  uint32 capability_flags = 6;
}

message Bitmap {
  bytes usage_bitmap = 1;
}

enum KeyAction {
  KEY_ACTION_RELEASE = 0;
  KEY_ACTION_PRESS = 1;
}

message FunctionKeyEvent {
  uint32 usage = 1;
  KeyAction action = 2;
}

message Ack {
  uint32 acked_type = 1;
}

enum ErrorCode {
  ERROR_CODE_NONE = 0;
  ERROR_CODE_UNKNOWN_TYPE = 1;
  ERROR_CODE_INVALID_LENGTH = 2;
  ERROR_CODE_INVALID_PARAM = 3;
  ERROR_CODE_NOT_READY = 4;
}

message Error {
  uint32 error_type = 1;
  ErrorCode error_code = 2;
}

message CdcPacketBody {
  oneof body {
    HelloReq hello_req = 1;
    HelloRsp hello_rsp = 2;
    Bitmap bitmap = 3;
    FunctionKeyEvent function_key_event = 4;
    Ack ack = 5;
    Error error = 6;
  }
}