[209] | 1 | /*
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| 2 | Reconnecting MQTT example - non-blocking
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| 3 |
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| 4 | This sketch demonstrates how to keep the client connected
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| 5 | using a non-blocking reconnect function. If the client loses
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| 6 | its connection, it attempts to reconnect every 5 seconds
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| 7 | without blocking the main loop.
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| 8 |
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| 9 | */
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| 10 |
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| 11 | #include <SPI.h>
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| 12 | #include <Ethernet.h>
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| 13 | #include <PubSubClient.h>
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| 14 |
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| 15 | // Update these with values suitable for your hardware/network.
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| 16 | byte mac[] = { 0xDE, 0xED, 0xBA, 0xFE, 0xFE, 0xED };
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| 17 | IPAddress ip(172, 16, 0, 100);
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| 18 | IPAddress server(172, 16, 0, 2);
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| 19 |
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| 20 | void callback(char* topic, byte* payload, unsigned int length) {
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| 21 | // handle message arrived
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| 22 | }
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| 23 |
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| 24 | EthernetClient ethClient;
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| 25 | PubSubClient client(ethClient);
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| 26 |
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| 27 | long lastReconnectAttempt = 0;
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| 28 |
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| 29 | boolean reconnect() {
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| 30 | if (client.connect("arduinoClient")) {
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| 31 | // Once connected, publish an announcement...
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| 32 | client.publish("outTopic","hello world");
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| 33 | // ... and resubscribe
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| 34 | client.subscribe("inTopic");
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| 35 | }
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| 36 | return client.connected();
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| 37 | }
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| 38 |
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| 39 | void setup()
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| 40 | {
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| 41 | client.setServer(server, 1883);
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| 42 | client.setCallback(callback);
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| 43 |
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| 44 | Ethernet.begin(mac, ip);
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| 45 | delay(1500);
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| 46 | lastReconnectAttempt = 0;
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| 47 | }
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| 48 |
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| 49 |
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| 50 | void loop()
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| 51 | {
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| 52 | if (!client.connected()) {
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| 53 | long now = millis();
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| 54 | if (now - lastReconnectAttempt > 5000) {
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| 55 | lastReconnectAttempt = now;
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| 56 | // Attempt to reconnect
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| 57 | if (reconnect()) {
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| 58 | lastReconnectAttempt = 0;
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| 59 | }
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| 60 | }
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| 61 | } else {
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| 62 | // Client connected
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| 63 |
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| 64 | client.loop();
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| 65 | }
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| 66 |
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| 67 | }
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