b708b47c4b
【主 题】：添加库文件 【描 述】： [原因]： [过程]： [影响]： 【结 束】 # 类型 包含: # feat：新功能（feature） # fix：修补bug # docs：文档（documentation） # style： 格式（不影响代码运行的变动） # refactor：重构（即不是新增功能，也不是修改bug的代码变动） # test：增加测试 # chore：构建过程或辅助工具的变动
58 lines
1.2 KiB
C++
58 lines
1.2 KiB
C++
/*
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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 <SPI.h>
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#include <Ethernet.h>
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#include <PubSubClient.h>
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#include <SRAM.h>
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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(char* topic, byte* payload, unsigned int length) {
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sram.seek(1);
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// do something with the message
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for(uint8_t i=0; i<length; 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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{
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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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{
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client.loop();
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}
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