Skip to content

Instantly share code, notes, and snippets.

Embed
What would you like to do?
#include <ESP8266WiFi.h>
#include <ESP8266mDNS.h>
#include <PubSubClient.h>
const char* cfg_wifi_ssid = "freifunk-myk.de";
const char* cfg_wifi_pwd = "";
const char* mqtt_server = "deinserver.local";
const unsigned int mqtt_port = 1883;
const char* mqtt_user = "admin";
const char* mqtt_pass = "test123";
//echo | openssl s_client -connect localhost:1883 | openssl x509 -fingerprint -noout
const char* mqtt_fprint = "D9:B2:A5:BB:E1:E5:4D:50:23:E1:84:24:29:44:BA:7C:54:01:BB:08";
WiFiClientSecure espClient;
PubSubClient client(espClient);
void setup() {
// put your setup code here, to run once:
Serial.begin(115200);
Serial.println("TestMQTT");
WiFi.mode(WIFI_STA);
WiFi.begin(cfg_wifi_ssid, cfg_wifi_pwd);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
client.setServer(mqtt_server, mqtt_port);
client.setCallback(callback);
while (!client.connected()) {
Serial.print("Attempting MQTT connection...");
verifyFingerprint();
if (client.connect(WiFi.macAddress().c_str(), mqtt_user, mqtt_pass)) {
Serial.println("connected");
client.subscribe("/foo");
}else{
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
// Wait 5 seconds before retrying
delay(5000);
}
}
}
void callback(char* topic, byte* payload, unsigned int length) {
Serial.print("Message arrived [");
Serial.print(topic);
Serial.print("] ");
char message[length + 1];
for (int i = 0; i < length; i++) {
message[i] = (char)payload[i];
}
message[length] = '\0';
Serial.println(message);
}
void verifyFingerprint() {
if(client.connected() || espClient.connected()) return; //Already connected
Serial.print("Checking TLS @ ");
Serial.print(mqtt_server);
Serial.print("...");
if (!espClient.connect(mqtt_server, mqtt_port)) {
Serial.println("Connection failed. Rebooting.");
Serial.flush();
ESP.restart();
}
if (espClient.verify(mqtt_fprint, mqtt_server)) {
Serial.print("Connection secure -> .");
} else {
Serial.println("Connection insecure! Rebooting.");
Serial.flush();
ESP.restart();
}
espClient.stop();
delay(100);
}
unsigned int counter = 0;
void loop() {
// put your main code here, to run repeatedly:
client.loop();
char buf[12];
itoa(counter, buf, 11);
client.publish("/test", buf);
counter++;
delay(1000);
}
@JST2018

This comment has been minimized.

Copy link

commented May 16, 2019

Moin und Danke! Das Tutorial hat mir sehr geholfen... nun habe ich aber ein Problem. Bei Zeile 82 kommt bei mir immer Insecure.... ich habe den Fingerprint auf dem Raspberry nach diesem befehl rausgesucht und reinkopiert. Ich benutze einen ESP32... sollte aber kein Problem sein denke ich. Irgendein Tipp, was ich machen könnte?

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
You can’t perform that action at this time.