Tasmota/tasmota/support_udp.ino

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/*
support_udp.ino - Udp support for Tasmota
Copyright (C) 2019 Heiko Krupp and Theo Arends
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 3 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 <http://www.gnu.org/licenses/>.
*/
#ifdef USE_EMULATION
#define UDP_BUFFER_SIZE 200 // Max UDP buffer size needed for M-SEARCH message
#define UDP_MSEARCH_SEND_DELAY 1500 // Delay in ms before M-Search response is send
#include <Ticker.h>
Ticker TickerMSearch;
IPAddress udp_remote_ip; // M-Search remote IP address
uint16_t udp_remote_port; // M-Search remote port
bool udp_connected = false;
bool udp_response_mutex = false; // M-Search response mutex to control re-entry
/*********************************************************************************************\
* UPNP/SSDP search targets
\*********************************************************************************************/
const char URN_BELKIN_DEVICE[] PROGMEM = "urn:belkin:device:**";
const char URN_BELKIN_DEVICE_CAP[] PROGMEM = "urn:Belkin:device:**";
const char UPNP_ROOTDEVICE[] PROGMEM = "upnp:rootdevice";
const char SSDPSEARCH_ALL[] PROGMEM = "ssdpsearch:all";
const char SSDP_ALL[] PROGMEM = "ssdp:all";
/*********************************************************************************************\
* UDP support routines
\*********************************************************************************************/
bool UdpDisconnect(void)
{
if (udp_connected) {
PortUdp.flush();
WiFiUDP::stopAll();
AddLog_P(LOG_LEVEL_DEBUG, PSTR(D_LOG_UPNP D_MULTICAST_DISABLED));
udp_connected = false;
}
return udp_connected;
}
bool UdpConnect(void)
{
if (!udp_connected) {
// Simple Service Discovery Protocol (SSDP)
if (PortUdp.beginMulticast(WiFi.localIP(), IPAddress(239,255,255,250), 1900)) {
AddLog_P(LOG_LEVEL_INFO, PSTR(D_LOG_UPNP D_MULTICAST_REJOINED));
udp_response_mutex = false;
udp_connected = true;
} else {
AddLog_P(LOG_LEVEL_INFO, PSTR(D_LOG_UPNP D_MULTICAST_JOIN_FAILED));
udp_connected = false;
}
}
return udp_connected;
}
void PollUdp(void)
{
if (udp_connected) {
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while (PortUdp.parsePacket()) {
char packet_buffer[UDP_BUFFER_SIZE]; // buffer to hold incoming UDP/SSDP packet
int len = PortUdp.read(packet_buffer, UDP_BUFFER_SIZE -1);
packet_buffer[len] = 0;
AddLog_P2(LOG_LEVEL_DEBUG_MORE, PSTR("UDP: Packet (%d)"), len);
// AddLog_P2(LOG_LEVEL_DEBUG_MORE, PSTR("\n%s"), packet_buffer);
// Simple Service Discovery Protocol (SSDP)
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#ifdef USE_SCRIPT_HUE
if (!udp_response_mutex && (strstr_P(packet_buffer, PSTR("M-SEARCH")) != nullptr)) {
#else
if (devices_present && !udp_response_mutex && (strstr_P(packet_buffer, PSTR("M-SEARCH")) != nullptr)) {
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#endif
udp_response_mutex = true;
udp_remote_ip = PortUdp.remoteIP();
udp_remote_port = PortUdp.remotePort();
// AddLog_P2(LOG_LEVEL_DEBUG_MORE, PSTR("UDP: M-SEARCH Packet from %s:%d\n%s"),
// udp_remote_ip.toString().c_str(), udp_remote_port, packet_buffer);
uint32_t response_delay = UDP_MSEARCH_SEND_DELAY + ((millis() &0x7) * 100); // 1500 - 2200 msec
LowerCase(packet_buffer, packet_buffer);
RemoveSpace(packet_buffer);
#ifdef USE_EMULATION_WEMO
if (EMUL_WEMO == Settings.flag2.emulation) {
if (strstr_P(packet_buffer, URN_BELKIN_DEVICE) != nullptr) { // type1 echo dot 2g, echo 1g's
TickerMSearch.attach_ms(response_delay, WemoRespondToMSearch, 1);
return;
}
else if ((strstr_P(packet_buffer, UPNP_ROOTDEVICE) != nullptr) || // type2 Echo 2g (echo & echo plus)
(strstr_P(packet_buffer, SSDPSEARCH_ALL) != nullptr) ||
(strstr_P(packet_buffer, SSDP_ALL) != nullptr)) {
TickerMSearch.attach_ms(response_delay, WemoRespondToMSearch, 2);
return;
}
}
#endif // USE_EMULATION_WEMO
#ifdef USE_EMULATION_HUE
if (EMUL_HUE == Settings.flag2.emulation) {
if ((strstr_P(packet_buffer, PSTR(":device:basic:1")) != nullptr) ||
(strstr_P(packet_buffer, UPNP_ROOTDEVICE) != nullptr) ||
(strstr_P(packet_buffer, SSDPSEARCH_ALL) != nullptr) ||
(strstr_P(packet_buffer, SSDP_ALL) != nullptr)) {
TickerMSearch.attach_ms(response_delay, HueRespondToMSearch);
return;
}
}
#endif // USE_EMULATION_HUE
udp_response_mutex = false;
}
}
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optimistic_yield(100);
}
}
#endif // USE_EMULATION