Initial commit, getting all the stuff from PlatformIO

.pio/libdeps/esp32dev/PicoMQTT/examples/server_auth/server_auth.ino

@@ -0,0 +1,57 @@
+#include <PicoMQTT.h>
+
+#if __has_include("config.h")
+#include "config.h"
+#endif
+
+#ifndef WIFI_SSID
+#define WIFI_SSID "WiFi SSID"
+#endif
+
+#ifndef WIFI_PASSWORD
+#define WIFI_PASSWORD "password"
+#endif
+
+class MQTT: public PicoMQTT::Server {
+    protected:
+        PicoMQTT::ConnectReturnCode auth(const char * client_id, const char * username, const char * password) override {
+            // only accept client IDs which are 3 chars or longer
+            if (String(client_id).length() < 3) {    // client_id is never NULL
+                return PicoMQTT::CRC_IDENTIFIER_REJECTED;
+            }
+
+            // only accept connections if username and password are provided
+            if (!username || !password) {  // username and password can be NULL
+                // no username or password supplied
+                return PicoMQTT::CRC_NOT_AUTHORIZED;
+            }
+
+            // accept two user/password combinations
+            if (
+                ((String(username) == "alice") && (String(password) == "secret"))
+                || ((String(username) == "bob") && (String(password) == "password"))) {
+                return PicoMQTT::CRC_ACCEPTED;
+            }
+
+            // reject all other credentials
+            return PicoMQTT::CRC_BAD_USERNAME_OR_PASSWORD;
+        }
+} mqtt;
+
+void setup() {
+    // Setup serial
+    Serial.begin(115200);
+
+    // Connect to WiFi
+    Serial.printf("Connecting to WiFi %s\n", WIFI_SSID);
+    WiFi.mode(WIFI_STA);
+    WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
+    while (WiFi.status() != WL_CONNECTED) { delay(1000); }
+    Serial.printf("WiFi connected, IP: %s\n", WiFi.localIP().toString().c_str());
+
+    mqtt.begin();
+}
+
+void loop() {
+    mqtt.loop();
+}