Get config from server

include/WifiHandler.hpp

@@ -24,4 +24,6 @@ void set_blink_rate(float interval);
 void connect();
 void resetSettings();
 
+String getMac(bool insertColons);
+
 #endif  // __WIFIHANDLER_HPP__

include/backend.hpp

@@ -0,0 +1,21 @@
+#ifndef __BACKEND_HPP__
+#define __BACKEND_HPP__
+
+#include <Arduino.h>
+#include <ArduinoJson.h>
+
+#include "../include/root_ca.hpp"
+
+extern JsonDocument config;
+extern bool isConfigValid;
+
+extern JsonDocument weatherData;
+
+bool parseJsonConfig(String& payload);
+bool getConfig();
+
+String urlencode(String str);
+
+bool getWeatherData();
+
+#endif  // __BACKEND_HPP__

include/root_ca.hpp

@@ -0,0 +1,6 @@
+#ifndef __ROOT_CA_H__
+#define __ROOT_CA_H__
+
+extern const char* root_ca;
+
+#endif  // __ROOT_CA_H__

src/WifiHandler.cpp

@@ -52,14 +52,14 @@ void connect() {
     // if it does not connect it starts an access point
     // and goes into a blocking loop awaiting configuration
     if (!wifiManager.autoConnect()) {
-        Serial.println("failed to connect and hit timeout");
+        Serial.println(String(millis()) + " Failed to connect and hit timeout");
         // reset and try again, or maybe put it to deep sleep
         ESP.restart();
         delay(1000);
     }
 
     // if you get here you have connected to the WiFi
-    Serial.print("connected with address: ");
+    Serial.print(String(millis()) + " Connected with address: ");
     Serial.println(WiFi.localIP());
 
     // keep LED on
@@ -69,7 +69,7 @@ void connect() {
 void resetSettings() {
     WiFiManager::Status status = {.wifi_status = 0U, .mode = WiFiManager::Mode::ERASING};
 
-    Serial.println("resetting wifi settings...");
+    Serial.println(String(millis()) + " Resetting wifi settings...");
 
     wifiManagerCb(status);
     wifiManager.resetSettings();
@@ -79,3 +79,8 @@ void resetSettings() {
 
     return;
 }
+
+String getMac(bool insertColons) {
+    String mac = wifiManager.getMacAsString(insertColons);
+    return mac;
+}

src/backend.cpp

@@ -0,0 +1,131 @@
+#include <HTTPClient.h>
+
+#include "../include/WifiHandler.hpp"
+#include "../include/backend.hpp"
+
+JsonDocument config;
+bool isConfigValid = false;
+String configTimestamp = "";
+
+static HTTPClient http;
+
+JsonDocument weatherData;
+
+bool parseJsonConfig(String& payload) {
+    bool isSuccess = false;
+
+    config.clear();
+
+    DeserializationError error = deserializeJson(config, payload);
+
+    if (error) {
+        Serial.print(String(millis()) + " DeserializeJson() failed: " + String(error.f_str()));
+    } else {
+        if (config["config version"] != "0.0.1") {
+            Serial.println(String(millis()) + " Unsupported config version");
+        } else {
+            isSuccess = true;
+        }
+    }
+
+    return isSuccess;
+}
+
+bool getConfig() {
+    String mac = getMac(false);
+    String url = "https://target.luon.net/~admar/Claire/" + mac + "/config.json";
+    String payload = "";
+    bool isSuccess = false;
+
+    http.begin(url, root_ca);
+    if (isConfigValid) {
+        http.addHeader("If-Modified-Since", configTimestamp);
+    }
+
+    const char* headerKeys[] = {"Last-Modified"};
+    const size_t headerKeysCount = sizeof(headerKeys) / sizeof(headerKeys[0]);
+    http.collectHeaders(headerKeys, headerKeysCount);
+
+    int httpCode = http.GET();
+
+    if (httpCode == 200) {
+        // Content is in payload
+        payload = http.getString();
+        isSuccess = parseJsonConfig(payload);
+
+        if (isSuccess) {
+            configTimestamp = http.header("Last-Modified");
+            Serial.println(String(millis()) + " ConfigTimestamp: " + configTimestamp);
+        }
+    } else if (httpCode == 304) {
+        // Content did not change
+        isSuccess = true;
+    } else {
+        Serial.println(String(millis()) + " Got http code " + httpCode);
+    }
+    http.end();
+
+    return isSuccess;
+}
+
+// From https://circuits4you.com/2019/03/21/esp8266-url-encode-decode-example/
+String urlencode(String str) {
+    String encodedString = "";
+    char c;
+    char code0;
+    char code1;
+    char code2;
+    for (int i = 0; i < str.length(); i++) {
+        c = str.charAt(i);
+        if (c == ' ') {
+            encodedString += '+';
+        } else if (isalnum(c)) {
+            encodedString += c;
+        } else {
+            code1 = (c & 0xf) + '0';
+            if ((c & 0xf) > 9) {
+                code1 = (c & 0xf) - 10 + 'A';
+            }
+            c = (c >> 4) & 0xf;
+            code0 = c + '0';
+            if (c > 9) {
+                code0 = c - 10 + 'A';
+            }
+            code2 = '\0';
+            encodedString += '%';
+            encodedString += code0;
+            encodedString += code1;
+            // encodedString+=code2;
+        }
+        yield();
+    }
+
+    return encodedString;
+}
+
+bool getWeatherData() {
+    String encodedAddress = urlencode(config["address"]);
+    String url =
+        "https://sinoptik.luon.net/"
+        "forecast?address=" +
+        encodedAddress +
+        "&metrics=precipitation&metrics=UVI&metrics=AQI&metrics="
+        "pollen&metrics=PAQI";
+
+    String payload = "";
+    bool isSuccess = false;
+
+    http.begin(url, root_ca);
+
+    int httpCode = http.GET();
+
+    if (httpCode > 0) {
+        payload = http.getString();
+        // isSuccess = parseJsonConfig(payload);
+    } else {
+        Serial.println(String(millis()) + " Got http code " + httpCode);
+    }
+    http.end();
+
+    return isSuccess;
+}

src/main.cpp

@@ -1,7 +1,7 @@
 #include <dESPatch.h>
 
 #include "../include/WifiHandler.hpp"
-#include "../include/root_ca.h"
+#include "../include/backend.hpp"
 
 DESPatch dESPatch;
 
@@ -15,7 +15,7 @@ void setup() {
 
     if (CONNECT_BUTTON >= 0) {
         // Give user 3 second chance to press button and reset settings
-        Serial.println("Waiting 3 seconds to check if user presses the button");
+        Serial.println(String(millis()) + " Waiting 3 seconds to check if user presses the button");
         delay(3000);
         if (not digitalRead(CONNECT_BUTTON)) {
             resetSettings();
@@ -31,12 +31,18 @@ void setup() {
 
     int x = dESPatch.configure(url, true, false, interval, false, root_ca);
 
-    Serial.print("dESPatch.configure() returned with code ");
-    Serial.println(x);
+    Serial.println(String(millis()) + " dESPatch.configure() returned with code " + String(x));
 }
 
 void loop(void) {
-    Serial.println("hello :-)");
+    isConfigValid = getConfig();
+
+    if (not isConfigValid) {
+        Serial.println(String(millis()) + " Invalid config");
+    } else {
+        Serial.println(String(millis()) + " Address: " + String(static_cast<const char*>(config["address"])));
+        // getWeatherData();
+    }
     dESPatch.checkForUpdate(true);
-    delay(5000);
+    delay(2000);
 }

src/root_ca.cpp

@@ -1,6 +1,3 @@
-#ifndef __ROOT_CA_H__
-#define __ROOT_CA_H__
-
 const char* root_ca =
     "-----BEGIN CERTIFICATE-----\n"
     "MIIFazCCA1OgAwIBAgIRAIIQz7DSQONZRGPgu2OCiwAwDQYJKoZIhvcNAQELBQAw\n"
@@ -33,5 +30,3 @@ const char* root_ca =
     "mRGunUHBcnWEvgJBQl9nJEiU0Zsnvgc/ubhPgXRR4Xq37Z0j4r7g1SgEEzwxA57d\n"
     "emyPxgcYxn/eR44/KJ4EBs+lVDR3veyJm+kXQ99b21/+jh5Xos1AnX5iItreGCc=\n"
     "-----END CERTIFICATE-----\n";
-
-#endif  // __ROOT_CA_H__