Add optional SSE demo

tasmota/html_uncompressed/HTTP_SCRIPT_ROOT_SSE_NO_WEB_DISPLAY.h

@@ -0,0 +1,21 @@
+const char HTTP_SCRIPT_ROOT[] PROGMEM =
+  "function la(p){"
+    "if(typeof(EventSource)!==\"undefined\"){"
+      "var e=new EventSource('?m=1');"
+      "e.onmessage=function(event){"
+        "eb('l1').innerHTML=event.data.replace(/{t}/g,\"<table style='width:100%%'>\")"
+                                     ".replace(/{s}/g,\"<tr><th>\")"
+    //                                 ".replace(/{m}/g,\"</th><td>\")"
+                                     ".replace(/{m}/g,\"</th><td style='width:20px;white-space:nowrap'>\")"  // I want a right justified column with left justified text
+                                     ".replace(/{e}/g,\"</td></tr>\")"
+                                     ".replace(/{c}/g,\"%%'><div style='text-align:center;font-weight:\");"
+      "}"
+    "}"
+    "a=p||'';"
+    "clearTimeout(lt);"
+    "if(x!=null){x.abort()}"             // Abort if no response within 2 seconds (happens on restart 1)
+    "x=new XMLHttpRequest();"
+    "x.open('GET','.?m=1'+a,true);"      // ?m related to Webserver->hasArg("m")
+    "x.send();"
+    "lt=setTimeout(la,20000);"           // 20s failure timeout
+  "}";

tasmota/xdrv_01_webserver.ino

@@ -27,6 +27,9 @@
 
 #define XDRV_01                               1
 
+// Enable below demo feature only if defines USE_UNISHOX_COMPRESSION and USE_SCRIPT_WEB_DISPLAY are disabled
+//#define USE_WEB_SSE
+
 #ifndef WIFI_SOFT_AP_CHANNEL
 #define WIFI_SOFT_AP_CHANNEL                  1          // Soft Access Point Channel number between 1 and 11 as used by WifiManager web GUI
 #endif
@@ -61,8 +64,6 @@ enum UploadTypes { UPL_TASMOTA, UPL_SETTINGS, UPL_EFM8BB1, UPL_TASMOTACLIENT, UP
   #endif
 #endif
 
-
-
 const char HTTP_SCRIPT_COUNTER[] PROGMEM =
   "var cn=180;"                           // seconds
   "function u(){"
@@ -74,7 +75,6 @@ const char HTTP_SCRIPT_COUNTER[] PROGMEM =
   "}"
   "wl(u);";
 
-
 #ifdef USE_UNISHOX_COMPRESSION
   #ifdef USE_SCRIPT_WEB_DISPLAY
     #include "./html_compressed/HTTP_SCRIPT_ROOT_WEB_DISPLAY.h"
@@ -86,7 +86,11 @@ const char HTTP_SCRIPT_COUNTER[] PROGMEM =
   #ifdef USE_SCRIPT_WEB_DISPLAY
     #include "./html_uncompressed/HTTP_SCRIPT_ROOT_WEB_DISPLAY.h"
   #else
-    #include "./html_uncompressed/HTTP_SCRIPT_ROOT_NO_WEB_DISPLAY.h"
+    #ifdef USE_WEB_SSE
+      #include "./html_uncompressed/HTTP_SCRIPT_ROOT_SSE_NO_WEB_DISPLAY.h"
+    #else
+      #include "./html_uncompressed/HTTP_SCRIPT_ROOT_NO_WEB_DISPLAY.h"
+    #endif  // USE_WEB_SSE
   #endif
   #include "./html_uncompressed/HTTP_SCRIPT_ROOT_PART2.h"
 #endif
@@ -346,8 +350,8 @@ const char kButtonAction[] PROGMEM =
   "md|wi|lg|co|tp|dl|rs";
 const char kButtonConfirm[] PROGMEM = D_CONFIRM_RESTART "|" D_CONFIRM_RESET_CONFIGURATION;
 
-enum CTypes { CT_HTML, CT_PLAIN, CT_XML, CT_JSON, CT_STREAM };
-const char kContentTypes[] PROGMEM = "text/html|text/plain|text/xml|application/json|application/octet-stream";
+enum CTypes { CT_HTML, CT_PLAIN, CT_XML, CT_STREAM, CT_APP_JSON, CT_APP_STREAM };
+const char kContentTypes[] PROGMEM = "text/html|text/plain|text/xml|text/event-stream|application/json|application/octet-stream";
 
 const char kLoggingOptions[] PROGMEM = D_SERIAL_LOG_LEVEL "|" D_WEB_LOG_LEVEL "|" D_MQTT_LOG_LEVEL "|" D_SYS_LOG_LEVEL;
 const char kLoggingLevels[] PROGMEM = D_NONE "|" D_ERROR "|" D_INFO "|" D_DEBUG "|" D_MORE_DEBUG;
@@ -1223,7 +1227,13 @@ bool HandleRootStatusRefresh(void)
     ExecuteWebCommand(svalue, SRC_WEBGUI);
   }
 #endif // USE_ZIGBEE
+
+#ifdef USE_WEB_SSE
+  WSContentBegin(200, CT_STREAM);
+  WSContentSend_P(PSTR("data: "));
+#else
   WSContentBegin(200, CT_HTML);
+#endif  // USE_WEB_SSE
   WSContentSend_P(PSTR("{t}"));
   XsnsCall(FUNC_WEB_SENSOR);
   XdrvCall(FUNC_WEB_SENSOR);
@@ -1259,6 +1269,10 @@ bool HandleRootStatusRefresh(void)
     }
   }
 #endif  // USE_TUYA_MCU
+
+#ifdef USE_WEB_SSE
+  WSContentSend_P(PSTR("\n\n"));
+#endif  // USE_WEB_SSE
   WSContentEnd();
 
   return true;
@@ -1990,7 +2004,7 @@ void HandleBackupConfiguration(void)
 
   Webserver->sendHeader(F("Content-Disposition"), attachment);
 
-  WSSend(200, CT_STREAM, "");
+  WSSend(200, CT_APP_STREAM, "");
 
   uint32_t cfg_crc32 = Settings.cfg_crc32;
   Settings.cfg_crc32 = GetSettingsCrc32();  // Calculate crc (again) as it might be wrong when savedata = 0 (#3918)
@@ -2671,14 +2685,14 @@ void HandleHttpCommand(void)
     WebGetArg(PSTR("password"), tmp2, sizeof(tmp2));
 
     if (!(!strcmp(tmp1, WEB_USERNAME) && !strcmp(tmp2, SettingsText(SET_WEBPWD)))) {
-      WSContentBegin(401, CT_JSON);
+      WSContentBegin(401, CT_APP_JSON);
       WSContentSend_P(PSTR("{\"" D_RSLT_WARNING "\":\"" D_NEED_USER_AND_PASSWORD "\"}"));
       WSContentEnd();
       return;
     }
   }
 
-  WSContentBegin(200, CT_JSON);
+  WSContentBegin(200, CT_APP_JSON);
   String svalue = Webserver->arg(F("cmnd"));
   if (svalue.length() && (svalue.length() < MQTT_MAX_PACKET_SIZE)) {
     uint32_t curridx = TasmotaGlobal.log_buffer_pointer;

tasmota/xdrv_10_scripter.ino

@@ -4926,7 +4926,7 @@ uint8_t DownloadFile(char *file) {
     }
     snprintf_P(attachment, sizeof(attachment), PSTR("attachment; filename=%s"), cp);
     Webserver->sendHeader(F("Content-Disposition"), attachment);
-    WSSend(200, CT_STREAM, "");
+    WSSend(200, CT_APP_STREAM, "");
 
     uint8_t buff[512];
     uint16_t bread;
@@ -5599,7 +5599,7 @@ void Script_Handle_Hue(String *path) {
     response = FPSTR(sHUE_ERROR_JSON);
   }
   AddLog(LOG_LEVEL_DEBUG_MORE, PSTR(D_LOG_HTTP D_HUE " Result (%s)"), response.c_str());
-  WSSend(code, CT_JSON, response);
+  WSSend(code, CT_APP_JSON, response);
   if (resp) {
     Run_Scripter(">E", 2, 0);
   }

tasmota/xdrv_20_hue.ino

@@ -438,7 +438,7 @@ void HueNotImplemented(String *path)
 {
   AddLog(LOG_LEVEL_DEBUG_MORE, PSTR(D_LOG_HTTP D_HUE_API_NOT_IMPLEMENTED " (%s)"), path->c_str());
 
-  WSSend(200, CT_JSON, PSTR("{}"));
+  WSSend(200, CT_APP_JSON, PSTR("{}"));
 }
 
 void HueConfigResponse(String *response)
@@ -457,7 +457,7 @@ void HueConfig(String *path)
 {
   String response = "";
   HueConfigResponse(&response);
-  WSSend(200, CT_JSON, response);
+  WSSend(200, CT_APP_JSON, response);
 }
 
 // device is forced to CT mode instead of HSB
@@ -680,7 +680,7 @@ void HueGlobalConfig(String *path) {
   response += F("},\"groups\":{},\"schedules\":{},\"config\":");
   HueConfigResponse(&response);
   response += F("}");
-  WSSend(200, CT_JSON, response);
+  WSSend(200, CT_APP_JSON, response);
 }
 
 void HueAuthentication(String *path)
@@ -688,7 +688,7 @@ void HueAuthentication(String *path)
   char response[38];
 
   snprintf_P(response, sizeof(response), PSTR("[{\"success\":{\"username\":\"%s\"}}]"), GetHueUserId().c_str());
-  WSSend(200, CT_JSON, response);
+  WSSend(200, CT_APP_JSON, response);
   AddLog(LOG_LEVEL_DEBUG_MORE, PSTR(D_LOG_HTTP D_HUE " Authentication Result (%s)"), response);
 }
 
@@ -996,7 +996,7 @@ void HueLights(String *path)
   }
   exit:
   AddLog(LOG_LEVEL_DEBUG_MORE, PSTR(D_LOG_HTTP D_HUE " Result (%s)"), response.c_str());
-  WSSend(code, CT_JSON, response);
+  WSSend(code, CT_APP_JSON, response);
 }
 
 void HueGroups(String *path)
@@ -1029,7 +1029,7 @@ void HueGroups(String *path)
   }
 
   AddLog(LOG_LEVEL_DEBUG_MORE, PSTR(D_LOG_HTTP D_HUE " HueGroups Result (%s)"), path->c_str());
-  WSSend(200, CT_JSON, response);
+  WSSend(200, CT_APP_JSON, response);
 }
 
 void HandleHueApi(String *path)

tasmota/xdrv_23_zigbee_3_hue.ino

@@ -384,7 +384,7 @@ void ZigbeeHandleHue(uint16_t shortaddr, uint32_t device_id, String &response) {
     response = msg[HUE_ERROR_JSON];
   }
   AddLog_P(LOG_LEVEL_DEBUG_MORE, PSTR(D_LOG_HTTP D_HUE " Result (%s)"), response.c_str());
-  WSSend(code, CT_JSON, response);
+  WSSend(code, CT_APP_JSON, response);
 
   free(buf);
 }

tasmota/xdrv_50_filesystem.ino

@@ -625,7 +625,7 @@ uint8_t UfsDownloadFile(char *file) {
   }
   snprintf_P(attachment, sizeof(attachment), PSTR("attachment; filename=%s"), cp);
   Webserver->sendHeader(F("Content-Disposition"), attachment);
-  WSSend(200, CT_STREAM, "");
+  WSSend(200, CT_APP_STREAM, "");
 
   uint8_t buff[512];
   uint32_t bread;
@@ -696,7 +696,7 @@ void donload_task(void *path) {
   }
   snprintf_P(attachment, sizeof(attachment), PSTR("attachment; filename=%s"), cp);
   Webserver->sendHeader(F("Content-Disposition"), attachment);
-  WSSend(200, CT_STREAM, "");
+  WSSend(200, CT_APP_STREAM, "");
 
   uint8_t *buff = (uint8_t*)malloc(DOWNLOAD_SIZE);
   if (buff) {

tasmota/xsns_60_GPS.ino

@@ -490,7 +490,7 @@ void UBXsendHeader(void)
 {
   Webserver->setContentLength(CONTENT_LENGTH_UNKNOWN);
   Webserver->sendHeader(F("Content-Disposition"), F("attachment; filename=TASMOTA.gpx"));
-  WSSend(200, CT_STREAM, F(
+  WSSend(200, CT_APP_STREAM, F(
     "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\" ?>\r\n"
     "<GPX version=\"1.1\" creator=\"TASMOTA\" xmlns=\"http://www.topografix.com/GPX/1/1\" \r\n"
     "xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"\r\n"