Flesh out esp32 example code

docs/examples/esp32/plain_upload.ino

@@ -1,50 +1,154 @@
 #include <HTTPClient.h>
+#include <NetworkClientSecure.h>
+const char *rootCACertificate = R"string_literal(
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+)string_literal"; // Root certificate for upload_url. Valid until 2038
+const char *upload_url = "https://eecs.engineering.oregonstate.edu/education/damsecure/public/api/data";
+const char *api_token = "Bearer 1|lBIopC6bcRzL7Jb2yopy74yTJkVltziyLVNX8V3Gc4eb41df";
+
 #include <WiFi.h>
+#define EAP_IDENTITY "onid@oregonstate.edu"
+#define EAP_USERNAME "onid@oregonstate.edu"
+#define EAP_PASSWORD "eduroam-password"
+const char *ssid = "eduroam";
+
+
+void connectWiFi();
+
+void uploadData(int data);
+void sendRequest(NetworkClientSecure *client, int data);
+void processResponse(HTTPClient *https, int httpCode);
+
+
+void setup() {
+    Serial.begin(115200);
+    delay(10);
+
+    connectWiFi();
+}
 
-#define API_URL "https://eecs.engineering.oregonstate.edu/education/damsecure/public/api/data"
-#define TOKEN   ""
-#define SSID    ""
-#define PASSWORD ""
 
-const char* ca = \
-"-----BEGIN CERTIFICATE-----\n"\
-"..."\
-"-----END CERTIFICATE-----\n";
+void loop() {
+    static int iterations = 1;
+    iterations++;
+
+    uploadData(iterations);
 
-int getNextNumber() {
-    static int number = 0;
-    return number++;
+    delay(1000 * 15);
 }
 
-void connectToWiFi() {
+
+void connectWiFi() {
+    int counter = 0;
+
+    Serial.printf("Connecting to network: %s\n", ssid);
+
     WiFi.disconnect(true);
-    WiFi.begin(SSID, PASSWORD);
-    Serial.print("Connecting to WiFi");
+    WiFi.mode(WIFI_STA);
+    WiFi.begin(ssid, WPA2_AUTH_PEAP, EAP_IDENTITY, EAP_USERNAME, EAP_PASSWORD);
+
     while (WiFi.status() != WL_CONNECTED) {
-        Serial.print('.');
         delay(500);
+        Serial.print(".");
+        counter++;
+        if (counter >= 60) {
+            // Unable to connect after 30 seconds timeout - reset board
+            ESP.restart();
+        }
     }
+
+    Serial.println("WiFi connected");
 }
 
-void setup() {
-    Serial.begin(115200);
 
-    connectToWiFi();
-    HTTPClient http;
-    http.begin(API_URL, ca);
+void uploadData(int data) {
+    NetworkClientSecure *client = new NetworkClientSecure;
 
-    http.addHeader("Accept", "application/json");
-    http.addHeader("Content-Type", "text/plain");
-    http.addHeader("Authorization", "Bearer " TOKEN);
+    if (!client) {
+        Serial.println("Unable to allocate client");
+        return;
+    }
 
-    int status = http.POST(String(getNextNumber()));
+    client->setCACert(rootCACertificate);
+    sendRequest(client, data);
+    delete client;
+}
 
-    Serial.print("Status: ");
-    Serial.println(status);
 
-    Serial.print("Response: ");
-    Serial.println(http.getString());
+void sendRequest(NetworkClientSecure *client, int data) {
+    // Using a different scoping block (function) for HTTPClient https to make sure it is
+    // destroyed before NetworkClientSecure *client is
+    HTTPClient https;
+
+    Serial.println("Connecting to DamSecure...");
+    if (!https.begin(*client, upload_url)) {
+        Serial.println("Unable to connect to DamSecure");
+        return;
+    }
+
+    Serial.println("Making POST request...");
+    https.addHeader("Accept", "application/json");
+    https.addHeader("Authorization", api_token);
+    https.addHeader("Content-Type", "text/plain");
+    int httpCode = https.POST(String(data));
 
-    http.end();
-    WiFi.disconnect();
+    processResponse(&https, httpCode);
+    https.end();
+}
+
+
+void processResponse(HTTPClient *https, int httpCode) {
+    // httpCode will be negative on error
+    if (httpCode <= 0) {
+        Serial.print("POST failed, error: ");
+        Serial.println(https->errorToString(httpCode).c_str());
+        return;
+    }
+
+    // HTTP request has been sent and server response header has been handled
+    Serial.printf("POST response code: %d\n", httpCode);
+
+    // file found at server
+    if (
+        httpCode == HTTP_CODE_OK ||
+        httpCode == HTTP_CODE_CREATED ||
+        httpCode == HTTP_CODE_MOVED_PERMANENTLY
+    ) {
+        String payload = https->getString();
+        Serial.print("POST accepted, id: ");
+        Serial.println(payload);
+    }
 }