adds wifi config tests

examples/DEV/OnDemandConfigPortal/OnDemandConfigPortal.ino

@@ -44,6 +44,7 @@ void configModeCallback (WiFiManager *myWiFiManager) {
   // Serial.println(WiFi.softAPIP());
   //if you used auto generated SSID, print it
   // Serial.println(myWiFiManager->getConfigPortalSSID());
+  esp_wifi_set_bandwidth(WIFI_IF_AP, WIFI_BW_HT20);
 }
 
 void saveParamCallback(){

examples/Tests/wificountry/wificountry.ino

@@ -0,0 +1,45 @@
+#include <WiFiManager.h>
+#include <PubSubClient.h>
+#include <ArduinoJson.h>
+
+WiFiClient espClient;
+PubSubClient client(espClient);
+char mqtt_server[40];
+void mqttCallback(char* topic, byte* payload, unsigned int length) {
+       // message received
+}
+
+void mqttReconnect() {
+       // reconnect code from PubSubClient example
+}
+
+void setup() {
+  Serial.begin(9600);
+     WiFiManager wifiManager;
+     wifiManager.setTimeout(180);
+
+     if(!wifiManager.autoConnect("AutoConnectAP")) {
+       Serial.println("failed to connect and hit timeout");
+       delay(3000);
+       ESP.restart();
+       delay(5000);
+     } 
+     // id/name, placeholder/prompt, default, length
+WiFiManagerParameter custom_mqtt_server("server", "mqtt server", mqtt_server, 40);
+wifiManager.addParameter(&custom_mqtt_server);
+
+const char* mqtt_server = custom_mqtt_server.getValue();
+
+     Serial.println("connected...yeey :)");
+
+     client.setServer(mqtt_server, 1883);
+     client.setCallback(mqttCallback);
+}
+
+void loop() {
+     if (!client.connected()) {
+       mqttReconnect();
+     }
+     client.loop();
+     yield();
+}