68 lines
1.4 KiB
C++
68 lines
1.4 KiB
C++
/*
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Reconnecting MQTT example - non-blocking
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This sketch demonstrates how to keep the client connected
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using a non-blocking reconnect function. If the client loses
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its connection, it attempts to reconnect every 5 seconds
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without blocking the main loop.
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*/
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#include <SPI.h>
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#include <Ethernet.h>
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#include <PubSubClient.h>
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// Update these with values suitable for your hardware/network.
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byte mac[] = { 0xDE, 0xED, 0xBA, 0xFE, 0xFE, 0xED };
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IPAddress ip(172, 16, 0, 100);
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IPAddress server(172, 16, 0, 2);
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void callback(char* topic, byte* payload, unsigned int length) {
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// handle message arrived
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}
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EthernetClient ethClient;
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PubSubClient client(ethClient);
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long lastReconnectAttempt = 0;
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boolean reconnect() {
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if (client.connect("arduinoClient")) {
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// Once connected, publish an announcement...
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client.publish("outTopic","hello world");
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// ... and resubscribe
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client.subscribe("inTopic");
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}
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return client.connected();
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}
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void setup()
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{
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client.setServer(server, 1883);
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client.setCallback(callback);
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Ethernet.begin(mac, ip);
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delay(1500);
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lastReconnectAttempt = 0;
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}
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void loop()
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{
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if (!client.connected()) {
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long now = millis();
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if (now - lastReconnectAttempt > 5000) {
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lastReconnectAttempt = now;
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// Attempt to reconnect
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if (reconnect()) {
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lastReconnectAttempt = 0;
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}
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}
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} else {
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// Client connected
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client.loop();
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}
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}
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