add standalone wifi network

src/WiFiNet.cpp

@@ -0,0 +1,77 @@
+#include "WiFiNet.h"
+
+WiFiNet::WiFiNet(
+    int stationMode,
+    const char* stationSSID,
+    const char* stationPassword,
+    const char* apSSID,
+    const char* apPassword,
+    const char* hostname,
+    int connectTimeout){
+    config.stationMode = stationMode;
+    config.stationSSID = String(stationSSID);
+    config.stationPassword = String(stationPassword);
+    config.apSSID = String(apSSID);
+    config.apPassword = String(apPassword);
+    config.hostname = String(hostname);
+    config.connectTimeout = connectTimeout;
+}
+
+Network* WiFiNet::init() {
+    config.fromFile("/config.json");
+    return this;
+}
+int WiFiNet::connect(){
+    if(config.valid){
+        WiFi.hostname(config.hostname);
+        Serial.println("Hostname: " + config.hostname);
+        if(!connectStation()) {
+            createAccessPoint();
+        }
+        startDNS();
+    }
+    return 1;
+}
+
+int WiFiNet::connectStation(){
+    if(config.stationMode == 0) return 0;
+    
+    int wifiConnectStart = millis();
+    WiFi.mode(WIFI_STA);
+    WiFi.begin(config.stationSSID.c_str(), config.stationPassword.c_str());
+    Serial.println("connect to " + config.stationSSID);
+    
+    while (WiFi.status() != WL_CONNECTED) {
+        delay(500);
+        Serial.print(".");
+        if(millis() - wifiConnectStart >= (uint)config.connectTimeout) {
+            Serial.println("wifi connect timeout");
+            return 0;
+        }
+    }
+    Serial.println("IP address: " + WiFi.localIP().toString());
+    Serial.println(WiFi.localIP().toString());
+    return 1;
+}
+
+int WiFiNet::createAccessPoint(){
+    Serial.println("Starting SoftAP: " + String(config.apSSID));
+    WiFi.disconnect();
+    WiFi.mode(WIFI_AP);
+    WiFi.softAP(config.apSSID.c_str(), config.apPassword.c_str());
+    Serial.println("SoftAP started! IP address: ");
+    Serial.println(WiFi.softAPIP().toString());
+    return 1;
+}
+
+// TODO make user configurable services
+int WiFiNet::startDNS() {
+    if (!MDNS.begin(config.hostname.c_str())) {
+         Serial.println("Error setting up MDNS responder!");
+         return 0;
+    } else {
+        Serial.println("mDNS responder started");
+        MDNS.addService("http", "tcp", 80);
+    }
+    return 1;
+}