Initial commit, getting all the stuff from PlatformIO

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

@@ -0,0 +1,54 @@
+#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");
+
+unsigned long last_subscribe_time = 0;
+int resubscribe = 1;
+
+void handler_foo(const char * topic, const char * payload) {
+    Serial.printf("Handler foo received message in topic '%s': %s\n", topic, payload);
+}
+
+void handler_bar(const char * topic, const char * payload) {
+    Serial.printf("Handler bar received message in topic '%s': %s\n", topic, payload);
+}
+
+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.begin();
+}
+
+void loop() {
+    mqtt.loop();
+
+    // Resubscribe every 5 seconds
+    if (millis() - last_subscribe_time >= 5000) {
+        if (++resubscribe % 2 == 0) {
+            mqtt.subscribe("picomqtt/#", handler_foo);
+        } else {
+            mqtt.subscribe("picomqtt/#", handler_bar);
+        }
+        last_subscribe_time = millis();
+    }
+}