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firmware/arduino/get-started/libraries/EspMQTTClient/examples/twoMQTTClientHandling/twoMQTTClientHandling.ino

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+/*
+  twoMQTTClientHandling.ino
+  The purpose of this exemple is to illustrate how to handle more than one MQTT connection a the same time in the same sketch.
+  Getting into "SimpleMQTTClient.ino" before this one is recommended (there is more comments)
+*/
+
+#include "EspMQTTClient.h"
+
+void onConnectionEstablishedClient2();
+
+// The client #1 will handle wifi connection (connecting, retrying, etc) and MQTT connection to 192.168.1.100
+EspMQTTClient client1(
+  "WifiSSID",
+  "WifiPassword",
+  "192.168.1.100",
+  "MQTTUsername",
+  "MQTTPassword",
+  "TestClient1"
+);
+
+// The client #2 will handle MQTT connection to 192.168.1.101.
+EspMQTTClient client2(
+  "192.168.1.101",
+  1883,
+  "MQTTUsername", 
+  "MQTTPassword",
+  "TestClient2"
+);
+
+void setup()
+{
+  Serial.begin(115200);
+
+  // We redirect the connection established callback of client2 to onConnectionEstablishedClient2.
+  // This will prevent the two client from calling the same callback (default to onConnectionEstablished)
+  client2.setOnConnectionEstablishedCallback(onConnectionEstablishedClient2); 
+}
+
+// For client1
+void onConnectionEstablished()
+{
+  client1.subscribe("mytopic/test", [](const String & payload) {
+    Serial.println(payload);
+  });
+  client1.publish("mytopic/test", "This is a message from client1");
+}
+
+// For client2
+void onConnectionEstablishedClient2()
+{
+  client2.subscribe("mytopic/test", [](const String & payload) {
+    Serial.println(payload);
+  });
+  client2.publish("mytopic/test", "This is a message from client2");
+}
+
+void loop()
+{
+  client1.loop();
+  client2.loop();
+}