examples/nmea_multiplexer.cpp

   1 /// This example demonstrates how to do a very basic NMEA multiplexer.
   2 /// It does not implement any error handling and other (normally necessary)
   3 /// stuff (configurability, error handling, etc.).
   4
   5 #include <vector>
   6 #include <marnav/nmea/nmea.hpp>
   7 #include <marnav/nmea/checksum.hpp>
   8 #include <marnav/io/default_nmea_reader.hpp>
   9 #include <marnav/io/serial.hpp>
  10 #include <marnav/utils/unique.hpp>
  11
  12 int main(int, char **)
  13 {
  14         using namespace marnav;
  15         using namespace marnav::io;
  16
  17         // prepare destinations
  18         std::vector<std::unique_ptr<serial>> destinations;
  19         destinations.push_back(utils::make_unique<serial>("dev/ttyUSB1", serial::baud::baud_4800,
  20                 serial::databits::bit_8, serial::stopbits::bit_1, serial::parity::none));
  21         destinations.push_back(utils::make_unique<serial>("dev/ttyUSB2", serial::baud::baud_4800,
  22                 serial::databits::bit_8, serial::stopbits::bit_1, serial::parity::none));
  23
  24         // open source device
  25         default_nmea_reader source{
  26                 utils::make_unique<serial>("/dev/ttyUSB0", serial::baud::baud_4800,
  27                         serial::databits::bit_8, serial::stopbits::bit_1, serial::parity::none)};
  28
  29         std::string data;
  30         while (source.read_sentence(data)) {
  31                 try {
  32                         // this is used only to check the received data, e.g. if the checksum is correct.
  33                         auto sentence = nmea::make_sentence(data);
  34
  35                         // send valid NMEA sentences to destinations
  36                         for (auto & destination : destinations) {
  37                                 destination->write(data.c_str(), data.size());
  38                         }
  39                 } catch (nmea::checksum_error) {
  40                         // let's just ignore them
  41                 }
  42         }
  43 }