Minimal boost::asio::serial_port read (read_some) example

The following example shows how to initialize a boost::asio serial_port , set its baud rate, parity & stop bits and then read data from it in a loop, printing the data to stdout as-is.

#include <boost/asio.hpp>
#include <iostream>

#define BUFSIZE 256

int main() {
    boost::asio::io_service io;
    // Open serial port
    boost::asio::serial_port serial(io, "/dev/ttyUSB0");

    // Configure basic serial port parameters: 115.2kBaud, 8N1
    serial.set_option(boost::asio::serial_port_base::baud_rate(115200));
    serial.set_option(boost::asio::serial_port_base::character_size(8 /* data bits */));
    serial.set_option(boost::asio::serial_port_base::parity(boost::asio::serial_port_base::parity::none));
    serial.set_option(boost::asio::serial_port_base::stop_bits(boost::asio::serial_port_base::stop_bits::one));

    // Read data in a loop and copy to stdout
    while(true) {
        char data[BUFSIZE];
        size_t n = serial.read_some(boost::asio::buffer(data, BUFSIZE));
        // Write data to stdout
        std::cout.write(data, n);
    }
}

For a more complete example that also shows how to open the serial port, see How to open & initialize boost::asio::serial_port