simple_receiver.cc

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/*
 * This file is part of the rc_dynamics_api package.
 *
 * Copyright (c) 2017 Roboception GmbH
 * All rights reserved
 *
 * Author: Christian Emmerich
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors
 * may be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <rc_dynamics_api/remote_interface.h>

#include <signal.h>

using namespace std;
namespace rcdyn = rc::dynamics;


static bool caught_signal = false;
void signal_callback_handler(int signum)
{
  printf("Caught signal %d, stopping program!\n",signum);
  caught_signal = true;
}


void printUsage(char *arg)
{
  cout << "\nRequests a data stream from the specified rc_visard IP "
          "\nand simply prints received data to std out."
       << "\n\nUsage: \n\t"
       << arg
       << " -v rcVisardIP -s stream [-i networkInterface][-n numMessages]"
       << endl;
}


int main(int argc, char *argv[])
{
  // Register signals and signal handler for proper program escape
  signal(SIGINT, signal_callback_handler);
  signal(SIGTERM, signal_callback_handler);


  string visardIP, networkIface = "", streamName = "";
  unsigned int maxNumMsgs = 50, cntMsgs = 0;
  bool userSetIp = false;
  bool userSetStreamType = false;

  int opt;
  while ((opt = getopt(argc, argv, "hn:v:i:s:")) != -1)
  {
    switch (opt)
    {
      case 's':
        streamName = string(optarg);
        userSetStreamType = true;
        break;
      case 'i':
        networkIface = string(optarg);
        break;
      case 'v':
        visardIP = string(optarg);
        userSetIp = true;
        break;
      case 'n':
        maxNumMsgs = (unsigned int) max(0, atoi(optarg));
        break;
      case 'h':
        printUsage(argv[0]);
        return EXIT_SUCCESS;
      default: /* '?' */
        printUsage(argv[0]);
        return EXIT_FAILURE;
    }
  }
  if (!userSetIp)
  {
    cerr << "Please specify rc_visard IP." << endl;
    printUsage(argv[0]);
    return EXIT_FAILURE;
  }
  if (!userSetStreamType)
  {
    cerr << "Please specify stream type." << endl;
    printUsage(argv[0]);
    return EXIT_FAILURE;
  }


  cout << "connecting rc_visard " << visardIP << "..." << endl;
  auto rcvisardDynamics = rcdyn::RemoteInterface::create(visardIP);

  try
  {
    // start the rc::dynamics module on the rc_visard
    cout << "starting rc_dynamics module on rc_visard..." << endl;
    rcvisardDynamics->start();
  }
  catch (exception &e)
  {
    cout << "ERROR! Could not start rc_dynamics module on rc_visard: "
         << e.what() << endl;
    return EXIT_FAILURE;
  }

  try
  {
    // easy-to-use creation of a data receiver, parameterized via stream type
    cout << "creating receiver and waiting for first messages to arrive..."
         << endl;
    auto receiver = rcvisardDynamics->createReceiverForStream(streamName, networkIface);
    receiver->setTimeout(250);

    // receive rc_dynamics protobuf msgs and print them
    for (; cntMsgs < maxNumMsgs && !caught_signal; ++cntMsgs)
    {
      auto msg = receiver->receive(
              rcvisardDynamics->getPbMsgTypeOfStream(streamName));
      if (msg)
      {
        cout << "received msg " << endl << msg->DebugString() << endl;
      }
    }
  }
  catch (exception &e)
  {
    cout << "ERROR during streaming: " << e.what() << endl;
  }


  try
  {
    cout << "stopping rc_dynamics module on rc_visard..." << endl;
    rcvisardDynamics->stop();
  }
  catch (exception &e)
  {
    cout << "ERROR! Could not start rc_dynamics module on rc_visard: "
         << e.what() << endl;
  }

  cout << "Received  " << cntMsgs << " " << streamName << " messages." << endl;
  return EXIT_SUCCESS;
}