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Use random MQTT client ID in example sketch

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Many users load the sketch having only changed WiFi SSID and password. When multiple users attempt to connect to the same broker using same client ID, they get rejected. Currently the chances of connecting to broker.mqtt-dashboard.com using "ESP8266Client" ID are fairly slim. This change adds a random number to the client ID, increasing chances of connection for new users of this library.
This commit is contained in:
Ivan Grokhotkov 2016-06-14 19:10:15 +08:00
parent 35ead348e3
commit 33170273a9
1 changed files with 6 additions and 1 deletions

7
examples/mqtt_esp8266/mqtt_esp8266.ino

@ -53,6 +53,8 @@ void setup_wifi() {
Serial.print(".");
}
randomSeed(micros());
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
@ -83,8 +85,11 @@ void reconnect() {
// Loop until we're reconnected
while (!client.connected()) {
Serial.print("Attempting MQTT connection...");
// Create a random client ID
String clientId = "ESP8266Client-";
clientId += String(random(0xffff), HEX);
// Attempt to connect
if (client.connect("ESP8266Client")) {
if (client.connect(clientId.c_str())) {
Serial.println("connected");
// Once connected, publish an announcement...
client.publish("outTopic", "hello world");