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Added options to:
* Set minimum RSSI for connection
* Connect to stored AP with strongest RSSI

src/AutoConnect.cpp

@@ -121,6 +121,14 @@ bool AutoConnect::begin(const char* ssid, const char* passphrase, unsigned long
     }
     AC_DBG("WiFi.begin(%s%s%s)\n", ssid == nullptr ? "" : ssid, passphrase == nullptr ? "" : ",", passphrase == nullptr ? "" : passphrase);
     cs = _waitForConnect(_connectTimeout) == WL_CONNECTED;
+#ifdef INC_RSSI_USE_SUP     //!!!
+    if(cs==true) {
+      if(WiFi.RSSI()<_apConfig.conMinRSSI || _apConfig.conFindMaxRSSI==true) {
+	_disconnectWiFi(false);
+	cs=false;
+      }
+    }
+#endif
   }
 
   // Reconnect with a valid credential as the autoReconnect option is enabled.
@@ -625,13 +633,46 @@ bool AutoConnect::_loadAvailCredential(const char* ssid) {
       AC_DBG("%d network(s) found\n", (int)nn);
       if (nn > 0) {
         // Determine valid credentials by BSSID.
+#ifdef INC_RSSI_USE_SUP  //!!!
+	int maxRSSIWifiIndex=-1;
+	int maxRSSICredIndex=-1;
+#endif	
         for (uint8_t i = 0; i < credential.entries(); i++) {
           credential.load(i, &_credential);
           for (uint8_t n = 0; n < nn; n++) {
+#ifdef INC_RSSI_USE_SUP  //!!!
+            if (!memcmp(_credential.bssid, WiFi.BSSID(n), sizeof(station_config_t::bssid))) {
+
+	      if(WiFi.RSSI(n)>=_apConfig.conMinRSSI) {
+		if(_apConfig.conFindMaxRSSI!=true) {
+		  return true;
+		}
+
+		if(maxRSSIWifiIndex<0) {
+		  maxRSSIWifiIndex=n;
+		  maxRSSICredIndex=i;
+		} else {
+		  if(WiFi.RSSI(n)>WiFi.RSSI(maxRSSIWifiIndex)) {
+		    maxRSSIWifiIndex=n;
+		    maxRSSICredIndex=i;
+		  }
+		}
+		
+	      }
+
+	    }
+#else
             if (!memcmp(_credential.bssid, WiFi.BSSID(n), sizeof(station_config_t::bssid)))
               return true;
+#endif
           }
         }
+#ifdef INC_RSSI_USE_SUP  //!!!
+	if(maxRSSIWifiIndex>=0) {
+	  credential.load(maxRSSICredIndex, &_credential);
+	  return true;
+	}
+#endif	
       }
     }
     else if (strlen(ssid))

src/AutoConnect.h

@@ -58,6 +58,10 @@ class AutoConnectConfig {
    *  assigned from macro. Password is same as above too.
    */
   AutoConnectConfig() :
+#ifdef INC_RSSI_USE_SUP  //!!!
+    conMinRSSI(AUTOCONNECT_CON_MIN_RSSI),
+    conFindMaxRSSI(AUTOCONNECT_CON_FIND_MAX_RSSI),
+#endif    
     apip(AUTOCONNECT_AP_IP),
     gateway(AUTOCONNECT_AP_GW),
     netmask(AUTOCONNECT_AP_NM),
@@ -90,6 +94,10 @@ class AutoConnectConfig {
    *  Configure by SSID for the captive portal access point and password.
    */
   AutoConnectConfig(const char* ap, const char* password, const unsigned long portalTimeout = 0, const uint8_t channel = AUTOCONNECT_AP_CH) :
+#ifdef INC_RSSI_USE_SUP  //!!!
+    conMinRSSI(AUTOCONNECT_CON_MIN_RSSI),
+    conFindMaxRSSI(AUTOCONNECT_CON_FIND_MAX_RSSI),
+#endif    
     apip(AUTOCONNECT_AP_IP),
     gateway(AUTOCONNECT_AP_GW),
     netmask(AUTOCONNECT_AP_NM),
@@ -122,6 +130,10 @@ class AutoConnectConfig {
   ~AutoConnectConfig() {}
 
   AutoConnectConfig& operator=(const AutoConnectConfig& o) {
+#ifdef INC_RSSI_USE_SUP  //!!!
+    conMinRSSI=o.conMinRSSI;
+    conFindMaxRSSI=o.conFindMaxRSSI;
+#endif    
     apip = o.apip;
     gateway = o.gateway;
     netmask = o.netmask;
@@ -153,6 +165,11 @@ class AutoConnectConfig {
     return *this;
   }
 
+
+#ifdef INC_RSSI_USE_SUP   //!!!
+  int       conMinRSSI;          /**< Minimum AP signal strength accepted for connection */
+  bool      conFindMaxRSSI;      /**< Find stored AP with highest signal strength for connection */
+#endif
   IPAddress apip;               /**< SoftAP IP address */
   IPAddress gateway;            /**< SoftAP gateway address */
   IPAddress netmask;            /**< SoftAP subnet mask */

src/AutoConnectDefs.h

@@ -10,6 +10,19 @@
 #ifndef _AUTOCONNECTDEFS_H_
 #define _AUTOCONNECTDEFS_H_
 
+//!!!
+#define INC_RSSI_USE_SUP   1
+
+#ifdef INC_RSSI_USE_SUP   //!!!
+#ifndef AUTOCONNECT_CON_MIN_RSSI
+#define AUTOCONNECT_CON_MIN_RSSI     -100       // no limit
+#endif
+
+#ifndef AUTOCONNECT_CON_FIND_MAX_RSSI
+#define AUTOCONNECT_CON_FIND_MAX_RSSI  false       // use first available
+#endif
+#endif
+
 // Uncomment the following AC_DEBUG to enable debug output.
 //#define AC_DEBUG
 
@@ -25,6 +38,7 @@
 #define AC_DBG_DUMB(...)
 #endif // !AC_DEBUG
 
+
 // Indicator to specify that AutoConnectAux handles elements with JSON.
 // Comment out the AUTOCONNECT_USE_JSON macro to detach the ArduinoJson.
 #ifndef AUTOCONNECT_NOUSE_JSON