Initial commit, getting all the stuff from PlatformIO

.pio/libdeps/esp32dev/PicoMQTT/examples/client_auth/client_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
+
+PicoMQTT::Client mqtt(
+    "broker.hivemq.com",    // broker address (or IP)
+    1883,                   // broker port (defaults to 1883)
+    "esp-client",           // Client ID
+    "username",             // MQTT username
+    "password"              // MQTT password
+);
+
+// PicoMQTT::Client mqtt;       // This will work too, but configuration will have to be set later (e.g. in setup())
+
+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.println("WiFi connected.");
+
+    // MQTT settings can be changed or set here instead
+    mqtt.host = "broker.hivemq.com";
+    mqtt.port = 1883;
+    mqtt.client_id = "esp-" + WiFi.macAddress();
+    mqtt.username = "username";
+    mqtt.password = "secret";
+
+    // Subscribe to a topic and attach a callback
+    mqtt.subscribe("picomqtt/#", [](const char * topic, const char * payload) {
+        // payload might be binary, but PicoMQTT guarantees that it's zero-terminated
+        Serial.printf("Received message in topic '%s': %s\n", topic, payload);
+    });
+
+    mqtt.begin();
+}
+
+void loop() {
+    mqtt.loop();
+
+    // Changing host, port, client_id, username or password here is OK too.  Changes will take effect after next
+    // reconnect.  To force reconnection, explicitly disconnect the client by calling mqtt.disconnect().
+}