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enocean_to_hue_bridge.cpp
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enocean_to_hue_bridge.cpp
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/*
* Copyright (C) 2018-2019 Ivan Schréter ([email protected])
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
* This copyright notice MUST APPEAR in all copies of the software!
*/
#include "enocean_to_hue_bridge.hpp"
// Define to prevent answering proxy calls and handle only local data.
//#define NO_PROXY
#include <system_error>
#include <poll.h>
#include <syslog.h>
#include <unistd.h>
#include <fcntl.h>
enocean_to_hue_bridge::enocean_to_hue_bridge(
const char* port,
std::deque<hue_sensor_command_posix>& bridges,
const char* map_file) :
bridges_(bridges),
hnd_(port, *this)
{
map_.load(map_file);
#ifndef NO_PROXY
proxy_server_fd_ = socket(AF_INET, SOCK_DGRAM, 0);
if (proxy_server_fd_ < 0)
throw std::system_error(errno, std::generic_category(), "Cannot open proxy socket");
auto flags = fcntl(proxy_server_fd_, F_GETFL);
if (flags < 0) {
auto err = errno;
close(proxy_server_fd_);
proxy_server_fd_ = -1;
throw std::system_error(
std::error_code(err, std::generic_category()),
"Cannot get proxy socket's flags");
}
if (fcntl(proxy_server_fd_, F_SETFL, flags | O_NONBLOCK) < 0) {
auto err = errno;
close(proxy_server_fd_);
proxy_server_fd_ = -1;
throw std::system_error(
std::error_code(err, std::generic_category()),
"Cannot set proxy socket's flags");
}
struct sockaddr_in servaddr;
memset(&servaddr, 0, sizeof(servaddr));
servaddr.sin_family = AF_INET; // IPv4
servaddr.sin_addr.s_addr = INADDR_ANY;
servaddr.sin_port = htons(22554);
if (bind(proxy_server_fd_, reinterpret_cast<const struct sockaddr*>(&servaddr), sizeof(servaddr)) < 0)
{
auto err = errno;
close(proxy_server_fd_);
proxy_server_fd_ = -1;
throw std::system_error(err, std::generic_category(), "Cannot bind proxy socket");
}
#endif
}
void enocean_to_hue_bridge::run_poll_loop()
{
time_t starttime;
time(&starttime);
syslog(LOG_INFO, "EnOcean child process start time %ld", starttime);
for (;;)
{
struct pollfd fds[11];
nfds_t cnt = 1;
fds[0].fd = hnd_.get_fd();
fds[0].events = POLLERR | POLLIN;
fds[0].revents = 0;
#ifndef NO_PROXY
fds[1].fd = proxy_server_fd_;
fds[1].events = POLLERR | POLLIN;
fds[1].revents = 0;
++cnt;
#endif
for (auto& b : bridges_) {
fds[cnt].fd = b.get_fd();
if (fds[cnt].fd >= 0) {
fds[cnt].events = b.get_events() | POLLERR;
fds[cnt].revents = 0;
++cnt;
}
}
auto res = poll(fds, cnt, 600000); // wake up at least every 5min
if (res < 0) {
if (errno == EINTR || errno == EAGAIN)
continue; // interrupted by signal or out of resources, retry
throw std::system_error(
std::error_code(errno, std::generic_category()),
"Error polling file descriptors");
}
if (fds[0].revents)
hnd_.poll();
cnt = 1;
#ifndef NO_PROXY
if (fds[1].revents)
proxy_poll();
++cnt;
#endif
for (auto& b : bridges_) {
if (fds[cnt].revents)
b.poll();
++cnt;
}
time_t curtime;
time(&curtime);
if (curtime - starttime >= 3600 && res == 0)
{
syslog(LOG_INFO, "EnOcean child process auto-restart at %ld", curtime);
_exit(0);
}
}
}
void enocean_to_hue_bridge::handler::handle_event(const enocean_event& event)
{
parent_.handle_event(event);
}
static void hexdump(char* dest, size_t dest_rem, const void* ptr, size_t size) noexcept
{
if (!size || dest_rem < 4) {
dest[0] = 0;
return;
}
auto p = reinterpret_cast<const uint8_t*>(ptr);
while (size-- && dest_rem >= 3) {
auto c = *p++;
static constexpr char hexchar[17] = "0123456789ABCDEF";
dest[0] = hexchar[c >> 4];
dest[1] = hexchar[c & 15];
dest[2] = ' ';
dest += 3;
dest_rem -= 3;
}
dest[-1] = 0;
}
void enocean_to_hue_bridge::handle_event(const enocean_event& event, uint32_t remote_ip)
{
uint32_t addr = 0;
int8_t button = 0;
switch (event.erp1.event_type) {
case enocean_erp1_type::CONTACT:
addr = event.erp1.contact_event.sender.raw();
button = event.erp1.contact_event.is_closed() ? 1 : 0;
break;
case enocean_erp1_type::SWITCH:
addr = event.erp1.switch_event.sender.raw();
button = event.erp1.switch_event.button_id();
break;
}
auto mapping = map_.map(event);
auto id = mapping.first;
auto bridge_set = mapping.second;
char data[128];
hexdump(data, sizeof(data), &event.buffer, event.hdr.total_size());
++total_event_count_;
auto ip_addr = reinterpret_cast<const unsigned char*>(&remote_ip);
auto dbm = event.erp1.contact_event.subtel[0].dbm;
auto ts = bridges_[0].timestamp();
syslog(LOG_INFO,
"EnOcean event, addr %x, button %d => ID %d@%x, RSSI -%u, index %lu, ts %lld, source %u.%u.%u.%u, data %s",
addr, button, id, bridge_set, dbm, total_event_count_,
ts, ip_addr[0], ip_addr[1], ip_addr[2], ip_addr[3], data);
//printf("\aGot event %d, type=%d: %s", ++count, int(event.hdr.packet_type), data);
bool do_send = false;
if (id) {
#ifdef NO_PROXY
syslog(LOG_INFO, "EnOcean post command: %d, bridge set %x", value, bridge_set);
do_send = true;
#else
// The same command can be received by multiple receivers. So we are posting only
// in case enough time has passed since the occurrence of the same command.
// Typically, all commands arrive within a millisecond or so, so let's test for
// 200 ms time difference to out filter duplicates. This gives us 5 commands/second
// from the same switch. Nobody is going to press the switch that fast :-).
auto res = command_states_.emplace(addr, std::make_pair(ts, id));
int64_t last_ts = 0;
int32_t last_id = -1;
if (res.second) {
// new entry
do_send = true;
} else {
// check ID or time difference
auto& data = res.first->second;
last_id = data.second;
last_ts = data.first;
if (uint64_t(ts - last_ts) >= 200 || last_id != id) {
do_send = true;
}
data.second = id;
data.first = ts;
}
#endif
if (do_send) {
syslog(LOG_INFO,
"EnOcean post command: %d (last %d), bridge set %x, ts %lld (last %lld, diff %lld)",
id, last_id, bridge_set, ts, last_ts, ts - last_ts);
uint32_t bit = 1;
for (auto& b : bridges_) {
if (bridge_set & bit)
b.post(id);
bit <<= 1;
}
}
}
}
void enocean_to_hue_bridge::proxy_poll()
{
uint64_t buffer[128];
struct sockaddr_in remote;
for (;;) {
socklen_t addr_len = sizeof(remote);
auto msg_len = recvfrom(proxy_server_fd_, &buffer, sizeof(buffer),
MSG_WAITALL, reinterpret_cast<struct sockaddr*>(&remote), &addr_len);
if (msg_len < 0) {
if (errno == EAGAIN)
return; // no data
throw std::system_error(
std::error_code(errno, std::generic_category()),
"Error polling data from proxy socket");
}
handle_event(*reinterpret_cast<enocean_event*>(&buffer), remote.sin_addr.s_addr);
}
}