87 lines
No EOL
2.9 KiB
C++
87 lines
No EOL
2.9 KiB
C++
/*
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Basic MQTT example (with SSL!)
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This sketch demonstrates the basic capabilities of the library.
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It connects to an MQTT server then:
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- publishes "hello world" to the topic "outTopic"
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- subscribes to the topic "inTopic", printing out any messages
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it receives. NB - it assumes the received payloads are strings not binary
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It will reconnect to the server if the connection is lost using a blocking
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reconnect function. See the 'mqtt_reconnect_nonblocking' example for how to
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achieve the same result without blocking the main loop.
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You will need to populate "certificates.h" with your trust anchors
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(see https://github.com/OPEnSLab-OSU/SSLClient/blob/master/TrustAnchors.md)
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and my_cert/my_key with your certificate/private key pair
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(see https://github.com/OPEnSLab-OSU/SSLClient#mtls).
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*/
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#include <SPI.h>
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#include <EthernetLarge.h>
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#include <SSLClient.h>
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#include "certificates.h" // This file must be regenerated
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#include <PubSubClient.h>
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const char my_cert[] = "FIXME";
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const char my_key[] = "FIXME";
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SSLClientParameters mTLS = SSLClientParameters::fromPEM(my_cert, sizeof my_cert, my_key, sizeof my_key);
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byte mac[] = { 0xDE, 0xED, 0xBA, 0xFE, 0xFE, 0xED };
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const char* mqttServer = "broker.example"; // Broker address
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IPAddress ip (192, 168, 1, 2); // Custom client static IP
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void callback(char* topic, byte* payload, unsigned int length) {
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Serial.print("Message arrived [");
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Serial.print(topic);
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Serial.print("] ");
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for (int i=0;i<length;i++) {
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Serial.print((char)payload[i]);
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}
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Serial.println();
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}
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EthernetClient ethClient;
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SSLClient ethClientSSL(ethClient, TAs, (size_t)TAs_NUM, A5);
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PubSubClient client(mqttServer, 8883, callback, ethClientSSL);
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void reconnect() {
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// Loop until we're reconnected
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while (!client.connected()) {
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Serial.print("Attempting MQTT connection...");
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// Attempt to connect
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if (client.connect("arduinoClient")) {
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Serial.println("connected");
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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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} else {
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Serial.print("failed, rc=");
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Serial.print(client.state());
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Serial.println(" try again in 5 seconds");
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// Wait 5 seconds before retrying
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delay(5000);
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}
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}
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}
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void setup(){
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// Start Serial
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Serial.begin(115200);
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while(!Serial);
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// Enable mutual TLS with SSLClient
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ethClientSSL.setMutualAuthParams(mTLS);
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// You can use Ethernet.init(pin) to configure the CS pin
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Ethernet.init(10); // Most Arduino shields
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//Ethernet.init(5); // MKR ETH shield
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//Ethernet.init(0); // Teensy 2.0
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//Ethernet.init(20); // Teensy++ 2.0
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//Ethernet.init(15); // ESP8266 with Adafruit Featherwing Ethernet
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//Ethernet.init(33); // ESP32 with Adafruit Featherwing Ethernet
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Ethernet.begin(mac, ip);
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}
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void loop(){
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if (!client.connected()) {
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reconnect();
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}
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client.loop();
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} |