Files
sdrpi-fpv-control/lib/port/unix/udp.cpp

56 lines
1.4 KiB
C++

#include "port/udp.h"
#include <cstring>
#include <poll.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include "crsf.h"
drivers::UdpDriver::UdpDriver(uint16_t port) {
fd = socket(AF_INET, SOCK_DGRAM, 0);
if (fd < 0) {
throw std::runtime_error(std::string("UdpDriver open error: ") + std::strerror(errno));
}
sockaddr_in addr{};
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
addr.sin_addr.s_addr = INADDR_ANY;
if (bind(fd, (sockaddr*)&addr, sizeof(addr)) < 0) if (fd < 0) {
close(fd);
throw std::runtime_error(std::string("UdpDriver bind error: ") + std::strerror(errno));
}
events = POLLIN;
}
bool drivers::UdpDriver::sendTo(std::span<const uint8_t> data, const std::string& addr, uint16_t port) {
if (fd < 0) return false;
sockaddr_in dst{};
dst.sin_family = AF_INET;
dst.sin_port = htons(port);
inet_aton(addr.c_str(), &dst.sin_addr);
auto w = sendto(fd, data.data(), data.size(), 0, (sockaddr*)&dst, sizeof(dst));
return w == data.size();
}
bool drivers::UdpDriver::recvPacket(std::vector<uint8_t>& out) {
out.resize(crsf::CRSF_MAX_FRAME_SIZE);
ssize_t received = recvfrom(fd, out.data(), out.size(), MSG_DONTWAIT, nullptr, nullptr);
if (received > 0) {
out.resize(received);
return true;
}
out.clear();
return false;
}
drivers::UdpDriver::~UdpDriver() {
close(fd);
}