Use a randomly generated suffix in MQTT client ID

src/main.cpp

@@ -3,6 +3,8 @@
 #include <arduino-timer.h>
 #include <ArduinoJson.h>
 #include <RFPowerView.h>
+#include <random>
+#include <chrono>
 #include "Shade.h"
 #include "ShadeRepository.h"
 #include "HADiscovery.h"
@@ -19,13 +21,27 @@ RFPowerView powerView(RF_CE_PIN, RF_CS_PIN, RF_IRQ_PIN, RF_ID);
 uint8_t lastRollingCode1 = 0x3D;
 uint8_t lastRollingCode2 = 0x96;
 
+static std::mt19937 generator(std::chrono::system_clock::now().time_since_epoch().count());
+
+std::string generate_client_id_suffix(int length) {
+  std::uniform_int_distribution<char> distribution('0', '9');
+
+  std::string random_string;
+  for (int i = 0; i < length; ++i) {
+    random_string += distribution(generator);
+  }
+  return random_string;
+}
+
+std::string clientID = "hotdog_" + generate_client_id_suffix(6);
+
 EspMQTTClient client(
   SECRET_WIFI_SSID,       // Wifi SSID
   SECRET_WIFI_PASSWORD, // Wifi Password
   SECRET_MQTT_SERVER_IP,   // MQTT Broker server IP
   SECRET_MQTT_USERNAME,          // MQTT Username
   SECRET_MQTT_PASSWORD,    // MQTT Password
-  "hotdog",          // MQTT Client ID
+  clientID.c_str(),          // MQTT Client ID
   1883
 );