syntax = "proto3";
package opcgateway;

service OpcGateway {
  rpc ReadTag(ReadTagRequest) returns (ReadTagResponse);
}
message ReadTagRequest {
  string server_id = 1;
  string addr = 2;
  string data_type = 3;
}
message ReadTagResponse {
  string value = 1;
  string opc_status_code = 2;
  string source_timestamp = 3;
  string server_timestamp = 4;
  bool persisted = 5;
}