Fixed bug in initialization logic at beginning of poll()

Full initialization now depends on "isInitialized" flag instead of monitoring Wifi connection, to protect against a loss of WiFi causing a re-initialization, instead of just a wifi reconnect with initWifi() alone.

src/HomeSpan.cpp

@@ -75,8 +75,11 @@ void Span::poll() {
   if(!strlen(category)){
     Serial.print("\n** FATAL ERROR: Cannot run homeSpan.poll() without an initial call to homeSpan.begin()!\n** PROGRAM HALTED **\n\n");
     while(1);    
+  }
 
-  } else if(WiFi.status()!=WL_CONNECTED){
+  if(!isInitialized){
+
+    Serial.print("\n");
         
     nvs_flash_init();         // initialize non-volatile-storage partition in flash 
     HAPClient::init();        // read NVS and load HAP settings  
@@ -93,6 +96,12 @@ void Span::poll() {
 
     Serial.print(displayName);
     Serial.print(" is READY!\n\n");
+    isInitialized=true;
+  }
+
+  if(WiFi.status()!=WL_CONNECTED){
+      Serial.print("*** LOST WIFI CONNECTION! ***\n\n");    
+      initWifi();
   }
 
   char cBuf[17]="?";

src/HomeSpan.h

@@ -52,6 +52,7 @@ struct Span{
   char *modelName;                              // model name of this device - broadcast as Bonjour field "md" 
   char category[3]="";                          // category ID of primary accessory - broadcast as Bonjour field "ci" (HAP Section 13)
   unsigned long snapTime;                       // current time (in millis) snapped before entering Service loops() or updates()
+  boolean isInitialized=false;                  // flag indicating HomeSpan has been initialized
   
   char *defaultSetupCode=DEFAULT_SETUP_CODE;          // Setup Code used for pairing
   uint8_t statusPin=DEFAULT_STATUS_PIN;               // pin for status LED