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58 lines
1.3 KiB
Arduino
58 lines
1.3 KiB
Arduino
/*
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Example of using a Stream object to store the message payload
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Uses SRAM library: https://github.com/ennui2342/arduino-sram
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but could use any Stream based class such as SD
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- connects to an MQTT server
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- publishes "hello world" to the topic "outTopic"
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- subscribes to the topic "inTopic"
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*/
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#include <Ethernet.h>
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#include <PubSubClient.h>
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#include <SPI.h>
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#include <SRAM.h>
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#define _UNUSED_ __attribute__((unused))
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// Update these with values suitable for your 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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SRAM sram(4, SRAM_1024);
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void callback(_UNUSED_ char* topic, _UNUSED_ uint8_t* payload, size_t plength) {
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sram.seek(1);
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// do something with the message
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for (size_t i = 0; i < plength; i++) {
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Serial.write(sram.read());
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}
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Serial.println();
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// Reset position for the next message to be stored
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sram.seek(1);
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}
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EthernetClient ethClient;
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PubSubClient client(server, 1883, callback, ethClient, sram);
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void setup() {
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Ethernet.begin(mac, ip);
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if (client.connect("arduinoClient")) {
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client.publish("outTopic", "hello world");
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client.subscribe("inTopic");
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}
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sram.begin();
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sram.seek(1);
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Serial.begin(9600);
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}
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void loop() {
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client.loop();
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}
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