Added homeSpan.setWebLogCallback(String (*f)())

Allows extension of initial table produced in WebLog, where f is a function that returns a String.  The returned String is copied into the WebLog HTML just before the </table> tag is printed in the initial table.

src/HAP.cpp

@@ -1277,6 +1277,10 @@ int HAPClient::getStatusURL(){
   
   response+="<tr><td>HomeKit Status:</td><td>" + String(HAPClient::nAdminControllers()?"PAIRED":"NOT PAIRED") + "</td></tr>\n";   
   response+="<tr><td>Max Log Entries:</td><td>" + String(homeSpan.webLog.maxEntries) + "</td></tr>\n"; 
+
+  if(homeSpan.weblogCallback)
+    response+=homeSpan.weblogCallback();
+
   response+="</table>\n";
   response+="<p></p>";
 

src/HomeSpan.h

@@ -232,6 +232,7 @@ class Span{
   uint16_t tcpPortNum=DEFAULT_TCP_PORT;                       // port for TCP communications between HomeKit and HomeSpan
   char qrID[5]="";                                            // Setup ID used for pairing with QR Code
   void (*wifiCallback)()=NULL;                                // optional callback function to invoke once WiFi connectivity is established
+  String (*weblogCallback)()=NULL;                            // optional callback function to invoke after header table in Web Log is produced
   void (*pairCallback)(boolean isPaired)=NULL;                // optional callback function to invoke when pairing is established (true) or lost (false)
   boolean autoStartAPEnabled=false;                           // enables auto start-up of Access Point when WiFi Credentials not found
   void (*apFunction)()=NULL;                                  // optional function to invoke when starting Access Point
@@ -347,6 +348,7 @@ class Span{
   }
 
   Span& setWebLogCSS(const char *css){webLog.css="\n" + String(css) + "\n";return(*this);}
+  Span& setWebLogCallback(String (*f)()){weblogCallback=f;return(*this);}
 
   void autoPoll(uint32_t stackSize=8192, uint32_t priority=1, uint32_t cpu=0){     // start pollTask()
     xTaskCreateUniversal([](void *parms){for(;;)homeSpan.pollTask();}, "pollTask", stackSize, NULL, priority, &pollTaskHandle, cpu);

src/src.ino

@@ -39,12 +39,22 @@ struct LED_Service : Service::LightBulb {
   }
 
   boolean update(){            
-    digitalWrite(ledPin,power->getNewVal());   
+    digitalWrite(ledPin,power->getNewVal());
+    WEBLOG("Power = %s",power->getNewVal()?"ON":"OFF");
     return(true);  
   }
 
 };
-      
+
+//////////////////////////////////////
+
+String extraData(){
+  String r;
+  r+="<tr><td>Free RAM:</td><td>" + String((double)(esp_get_free_internal_heap_size() / 1024),2) + " Kb (" + String(esp_get_free_internal_heap_size()) + " bytes)</td></tr>\n"; 
+  r+="<tr><td>Free PSRAM:</td><td>" + String((double)(esp_get_free_heap_size() / 1024 / 1024),2) + " Mb (" + String(esp_get_free_heap_size()) + " bytes)</td></tr>\n";
+  return(r);
+}
+
 //////////////////////////////////////
 
 void setup() {
@@ -55,7 +65,7 @@ void setup() {
 
 //  homeSpan.setControlPin(21);
   
-  homeSpan.setLogLevel(2);
+  homeSpan.setLogLevel(2).enableWebLog(20).setWebLogCallback(extraData);
 //  homeSpan.reserveSocketConnections(10);
   
 //  homeSpan.setApSSID("HS_Setup");