leave WiFi disconnected by default

implement controlled retry - fixed at 60 seconds

Author: rjwats

data/config/wifiSettings.json

@@ -1,5 +1,5 @@
 {
-  "ssid":"ssid",
+  "ssid":"",
   "password":"password",
   "hostname":"esp8266-react",
   "static_ip_config":false

interface/src/forms/APSettingsForm.js

@@ -66,7 +66,7 @@ class APSettingsForm extends React.Component {
             <Fragment>
               <TextValidator
                 validators={['required', 'matchRegexp:^.{1,32}$']}
-                errorMessages={['Access Point SSID is required', 'Access Point SSID must be 32 characeters or less']}
+                errorMessages={['Access Point SSID is required', 'Access Point SSID must be 32 characters or less']}
                 name="ssid"
                 label="Access Point SSID"
                 className={classes.textField}

interface/src/forms/WiFiSettingsForm.js

@@ -99,8 +99,8 @@ class WiFiSettingsForm extends React.Component {
                 {
                   selectedNetwork ? this.renderSelectedNetwork() :
                     <TextValidator
-                      validators={['required', 'matchRegexp:^.{1,32}$']}
-                      errorMessages={['SSID is required', 'SSID must be 32 characeters or less']}
+                      validators={['matchRegexp:^.{0,32}$']}
+                      errorMessages={['SSID must be 32 characters or less']}
                       name="ssid"
                       label="SSID"
                       className={classes.textField}

src/WiFiSettingsService.cpp

@@ -56,27 +56,11 @@ void WiFiSettingsService::onConfigUpdated() {
 }
 
 void WiFiSettingsService::reconfigureWiFiConnection() {
-    Serial.println("Reconfiguring WiFi...");
-
     // disconnect and de-configure wifi and software access point
     WiFi.disconnect(true);
 
-    // configure for static IP
-    if (_staticIPConfig) {
-      WiFi.config(_localIP, _gatewayIP,  _subnetMask, _dnsIP1, _dnsIP2);
-    } else { 
-     // configure for DHCP
-#if defined(ESP8266) 
-      WiFi.config(INADDR_ANY, INADDR_ANY, INADDR_ANY);
-      WiFi.hostname(_hostname);
-#elif defined(ESP_PLATFORM)
-      WiFi.config(INADDR_NONE, INADDR_NONE, INADDR_NONE);
-      WiFi.setHostname(_hostname.c_str());
-#endif
-    }
-
-    // connect to the network
-    WiFi.begin(_ssid.c_str(), _password.c_str());
+    // reset last connection attempt to force loop to reconnect immediately
+    _lastConnectionAttempt = 0;
 }
 
 void WiFiSettingsService::readIP(JsonObject& root, String key, IPAddress& _ip){
@@ -90,3 +74,40 @@ void WiFiSettingsService::writeIP(JsonObject& root, String key, IPAddress& _ip){
     root[key] = _ip.toString();
   }
 }
+
+void WiFiSettingsService::loop() {
+  unsigned long currentMillis = millis();
+  if (!_lastConnectionAttempt || (unsigned long)(currentMillis - _lastConnectionAttempt) >= WIFI_RECONNECTION_DELAY) {
+    _lastConnectionAttempt = currentMillis;
+     manageSTA();
+  }
+}
+
+void WiFiSettingsService::manageSTA() {
+  // Abort if already connected, or if we have no SSID
+  if (WiFi.isConnected() || _ssid.length() == 0) {
+    return;
+  }
+  // Connect or reconnect as required
+  if ((WiFi.getMode() & WIFI_STA) == 0) {
+    Serial.println("Connecting to WiFi.");    
+    if (_staticIPConfig) {
+      // configure for static IP
+      WiFi.config(_localIP, _gatewayIP,  _subnetMask, _dnsIP1, _dnsIP2);
+    } else {
+      // configure for DHCP
+#if defined(ESP8266) 
+      WiFi.config(INADDR_ANY, INADDR_ANY, INADDR_ANY);
+      WiFi.hostname(_hostname);
+#elif defined(ESP_PLATFORM)
+      WiFi.config(INADDR_NONE, INADDR_NONE, INADDR_NONE);
+      WiFi.setHostname(_hostname.c_str());
+#endif
+    }
+    // attempt to connect to the network
+    WiFi.begin(_ssid.c_str(), _password.c_str());
+  } else {
+    Serial.println("Retrying WiFi connection.");
+    WiFi.reconnect();
+  }  
+}

src/WiFiSettingsService.h

@@ -6,6 +6,7 @@
 
 #define WIFI_SETTINGS_FILE "/config/wifiSettings.json"
 #define WIFI_SETTINGS_SERVICE_PATH "/rest/wifiSettings"
+#define WIFI_RECONNECTION_DELAY 1000 * 60
 
 class WiFiSettingsService : public AdminSettingsService {
 
@@ -15,13 +16,13 @@ class WiFiSettingsService : public AdminSettingsService {
     ~WiFiSettingsService();
 
     void begin();
+    void loop();
 
   protected:
 
     void readFromJsonObject(JsonObject& root);
     void writeToJsonObject(JsonObject& root);
     void onConfigUpdated();
-    void reconfigureWiFiConnection();
 
   private:
     // connection settings
@@ -30,6 +31,9 @@ class WiFiSettingsService : public AdminSettingsService {
     String _hostname;
     bool _staticIPConfig;
 
+    // for the mangement delay loop
+    unsigned long _lastConnectionAttempt;
+
     // optional configuration for static IP address
     IPAddress _localIP;
     IPAddress _gatewayIP;
@@ -39,6 +43,8 @@ class WiFiSettingsService : public AdminSettingsService {
 
     void readIP(JsonObject& root, String key, IPAddress& _ip);
     void writeIP(JsonObject& root, String key, IPAddress& _ip);
+    void reconfigureWiFiConnection();
+    void manageSTA();
 
 };
 

src/main.cpp

@@ -41,8 +41,9 @@ APStatus apStatus = APStatus(&server, &securitySettingsService);
 SystemStatus systemStatus = SystemStatus(&server, &securitySettingsService);;
 
 void setup() {
-    // Disable wifi config persistance
+    // Disable wifi config persistance and auto reconnect
     WiFi.persistent(false);
+    WiFi.setAutoReconnect(false);
 
     Serial.begin(SERIAL_BAUD_RATE);
     SPIFFS.begin();
@@ -86,6 +87,7 @@ void setup() {
 }
 
 void loop() {
+  wifiSettingsService.loop();
   apSettingsService.loop();
   ntpSettingsService.loop();
   otaSettingsService.loop();