Make SSDP event-driven

libraries/ESP8266SSDP/ESP8266SSDP.cpp

@@ -26,25 +26,36 @@ License (MIT license):
 
 */
 #define LWIP_OPEN_SRC
+#include <functional>
 #include "ESP8266SSDP.h"
+#include "WiFiUdp.h"
+#include "debug.h"
 
 extern "C" {
+  #include "osapi.h"
+  #include "ets_sys.h"
   #include "user_interface.h"
-  #include "mem.h"
 }
-#include "lwip/ip_addr.h"
-#include "lwip/igmp.h"
 
-//#define DEBUG_SSDP  Serial
+#include "lwip/opt.h"
+#include "lwip/udp.h"
+#include "lwip/inet.h"
+#include "lwip/igmp.h"
+#include "lwip/mem.h"
+#include "include/UdpContext.h"
+
+// #define DEBUG_SSDP  Serial
 
 #define SSDP_INTERVAL     1200
 #define SSDP_PORT         1900
 #define SSDP_METHOD_SIZE  10
 #define SSDP_URI_SIZE     2
 #define SSDP_BUFFER_SIZE  64
-
+#define SSDP_MULTICAST_TTL 1
 static const IPAddress SSDP_MULTICAST_ADDR(239, 255, 255, 250);
 
+
+
 static const char* _ssdp_response_template = 
   "HTTP/1.1 200 OK\r\n"
   "EXT:\r\n"
@@ -108,7 +119,17 @@ static const char* _ssdp_schema_template =
   "</root>\r\n"
   "\r\n";
 
-SSDPClass::SSDPClass(){
+
+struct SSDPTimer {
+  ETSTimer timer;
+};
+
+SSDPClass::SSDPClass() :
+_server(0),
+_port(80),
+_pending(false),
+_timer(new SSDPTimer)
+{
   _uuid[0] = '\0';
   _modelNumber[0] = '\0';
   _friendlyName[0] = '\0';
@@ -119,65 +140,95 @@ SSDPClass::SSDPClass(){
   _manufacturer[0] = '\0';
   _manufacturerURL[0] = '\0';
   sprintf(_schemaURL, "ssdp/schema.xml");
-  _port = 80;
-  _pending = false;
 }
 
 SSDPClass::~SSDPClass(){
+  delete _timer;
 }
 
-void SSDPClass::begin(){
-  ip_addr_t ifaddr;
-  ip_addr_t multicast_addr;
-
+bool SSDPClass::begin(){
   _pending = false;
-
-  ifaddr.addr = WiFi.localIP();
-  multicast_addr.addr = (uint32_t) SSDP_MULTICAST_ADDR;
-  igmp_joingroup(&ifaddr, &multicast_addr);
-
-  uint8_t mac[6];
-  WiFi.macAddress(mac);
+  
   uint32_t chipId = ESP.getChipId();
-  sprintf(_uuid, "38323636-4558-%04x-%04x-%02x%02x%02x%02x%02x%02x",
-    (chipId >> 16) & 0xFFFF, chipId & 0xFFFF,
-    mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]
-  );
+  sprintf(_uuid, "38323636-4558-4dda-9188-cda0e6%02x%02x%02x",
+    (uint16_t) ((chipId >> 16) & 0xff),
+    (uint16_t) ((chipId >>  8) & 0xff), 
+    (uint16_t)   chipId        & 0xff  );
+
 #ifdef DEBUG_SSDP
   DEBUG_SSDP.printf("SSDP UUID: %s\n", (char *)_uuid);
 #endif
-  _server.begin(SSDP_PORT);
+
+  if (_server) {
+    _server->unref();
+    _server = 0;
+  }
+
+  _server = new UdpContext;
+  _server->ref();
+
+  ip_addr_t ifaddr;
+  ifaddr.addr = WiFi.localIP();
+  ip_addr_t multicast_addr;
+  multicast_addr.addr = (uint32_t) SSDP_MULTICAST_ADDR;
+  if (igmp_joingroup(&ifaddr, &multicast_addr) != ERR_OK ) {
+    DEBUGV("SSDP failed to join igmp group");
+    return false;
+  }
+  
+  if (!_server->listen(*IP_ADDR_ANY, SSDP_PORT)) {
+    return false;
+  }
+
+  _server->setMulticastInterface(ifaddr);
+  _server->setMulticastTTL(SSDP_MULTICAST_TTL);
+  _server->onRx(std::bind(&SSDPClass::_update, this));
+  if (!_server->connect(multicast_addr, SSDP_PORT)) {
+    return false;
+  }
+
+  _startTimer();
+
+  return true;
 }
 
 void SSDPClass::_send(ssdp_method_t method){
-#ifdef DEBUG_SSDP
-  if(method == NONE){
-    DEBUG_SSDP.print("Sending Response to ");
-    DEBUG_SSDP.print(_server.remoteIP());
-    DEBUG_SSDP.print(":");
-    DEBUG_SSDP.println(_server.remotePort());
-  }else if(method == NOTIFY){
-    DEBUG_SSDP.println("Sending Notify to 239.255.255.250:1900");
-  }
-#endif
-  
-  if(method == NONE){
-    _server.beginPacket(_server.remoteIP(), _server.remotePort());
-  } else {
-    _server.beginPacket(SSDP_MULTICAST_ADDR, SSDP_PORT);
-  }
-
+  char buffer[1460];
   uint32_t ip = WiFi.localIP();
   
-  _server.printf(_ssdp_packet_template,
+  int len = snprintf(buffer, sizeof(buffer), 
+    _ssdp_packet_template,
     (method == NONE)?_ssdp_response_template:_ssdp_notify_template,
     SSDP_INTERVAL,
     _modelName, _modelNumber,
     _uuid,
     IP2STR(&ip), _port, _schemaURL
   );
-    
-  _server.endPacket();
+
+  _server->append(buffer, len);
+
+  ip_addr_t remoteAddr;
+  uint16_t remotePort;
+  if(method == NONE) {
+    remoteAddr.addr = _respondToAddr;
+    remotePort = _respondToPort;
+#ifdef DEBUG_SSDP
+    DEBUG_SSDP.print("Sending Response to ");
+#endif
+  } else {
+    remoteAddr.addr = SSDP_MULTICAST_ADDR;
+    remotePort = SSDP_PORT;
+#ifdef DEBUG_SSDP
+    DEBUG_SSDP.println("Sending Notify to ");
+#endif
+  }
+#ifdef DEBUG_SSDP
+  DEBUG_SSDP.print(IPAddress(remoteAddr.addr));
+  DEBUG_SSDP.print(":");
+  DEBUG_SSDP.println(remotePort);
+#endif
+
+  _server->send(&remoteAddr, remotePort);
 }
 
 void SSDPClass::schema(WiFiClient client){
@@ -196,10 +247,13 @@ void SSDPClass::schema(WiFiClient client){
   );
 }
 
-uint8_t SSDPClass::update(){
-  if(!_pending && _server.parsePacket() > 0){
+void SSDPClass::_update(){
+  if(!_pending && _server->next()) {
     ssdp_method_t method = NONE;
 
+    _respondToAddr = _server->getRemoteAddress();
+    _respondToPort = _server->getRemotePort();
+
     typedef enum {METHOD, URI, PROTO, KEY, VALUE, ABORT} states;
     states state = METHOD;
 
@@ -211,8 +265,8 @@ uint8_t SSDPClass::update(){
 
     char buffer[SSDP_BUFFER_SIZE] = {0};
     
-    while(_server.available() > 0){
-      char c = _server.read();
+    while(_server->getSize() > 0){
+      char c = _server->read();
 
       (c == '\r' || c == '\n') ? cr++ : cr = 0;
 
@@ -280,8 +334,6 @@ uint8_t SSDPClass::update(){
           break;
       }
     }
-    
-    _server.flush();
   }
 
   if(_pending && (millis() - _process_time) > _delay){
@@ -291,6 +343,12 @@ uint8_t SSDPClass::update(){
     _notify_time = millis();
     _send(NOTIFY);
   }
+
+  if (_pending) {
+    while (_server->next())
+      _server->flush();
+  }
+
 }
 
 void SSDPClass::setSchemaURL(const char *url){
@@ -333,4 +391,16 @@ void SSDPClass::setManufacturerURL(const char *url){
   strlcpy(_manufacturerURL, url, sizeof(_manufacturerURL));
 }
 
+void SSDPClass::_onTimerStatic(SSDPClass* self) {
+  self->_update();
+}
+
+void SSDPClass::_startTimer() {
+  ETSTimer* tm = &(_timer->timer);
+  const int interval = 1000;
+  os_timer_disarm(tm);
+  os_timer_setfn(tm, reinterpret_cast<ETSTimerFunc*>(&SSDPClass::_onTimerStatic), reinterpret_cast<void*>(this));
+  os_timer_arm(tm, interval, 1 /* repeat */);
+}
+
 SSDPClass SSDP;

libraries/ESP8266SSDP/ESP8266SSDP.h

@@ -33,6 +33,8 @@ License (MIT license):
 #include <ESP8266WiFi.h>
 #include <WiFiUdp.h>
 
+class UdpContext;
+
 #define SSDP_UUID_SIZE              37
 #define SSDP_SCHEMA_URL_SIZE        64
 #define SSDP_FRIENDLY_NAME_SIZE     64
@@ -50,13 +52,16 @@ typedef enum {
   NOTIFY
 } ssdp_method_t;
 
+
+struct SSDPTimer;
+
 class SSDPClass{
   public:
     SSDPClass();
     ~SSDPClass();
 
-    void begin();
-    uint8_t update();
+    bool begin();
+
     void schema(WiFiClient client);
 
     void setName(const String& name) { setName(name.c_str()); }
@@ -78,9 +83,19 @@ class SSDPClass{
     void setManufacturerURL(const String& url) { setManufacturerURL(url.c_str()); }
     void setManufacturerURL(const char *url);
     void setHTTPPort(uint16_t port);
-    
-  private:
-    WiFiUDP _server;
+
+  protected:
+    void _send(ssdp_method_t method);
+    void _update();
+    void _startTimer();
+    static void _onTimerStatic(SSDPClass* self);
+
+    UdpContext* _server;
+    SSDPTimer* _timer;
+
+    IPAddress _respondToAddr;
+    uint16_t  _respondToPort;
+
     bool _pending;
     unsigned short _delay;
     unsigned long _process_time;
@@ -97,8 +112,6 @@ class SSDPClass{
     char _modelName[SSDP_MODEL_NAME_SIZE];
     char _modelURL[SSDP_MODEL_URL_SIZE];
     char _modelNumber[SSDP_MODEL_VERSION_SIZE];
-
-    void _send(ssdp_method_t method);
 };
 
 extern SSDPClass SSDP;

libraries/ESP8266SSDP/examples/SSDP/SSDP.ino

@@ -48,6 +48,5 @@ void setup() {
 
 void loop() {
   HTTP.handleClient();
-  SSDP.update();
   delay(1);
 }