- Tue Sep 27, 2016 1:05 am
#55750
Hello,
What am I doing wrong? I'd like ot use a DNS query to resolve the IP address of my MQTT broker but I can't get it to work. I've tried using the WiFi.config() method but it won't connect to my MQTT broker.
I've also tried the PubSubClient.setServer() method to no avail, the broker IP is not resolved and no connection is made. It works fine if I use an IPAddress variable instead of the char* to point out the broker. Can anyone help me?
What am I doing wrong? I'd like ot use a DNS query to resolve the IP address of my MQTT broker but I can't get it to work. I've tried using the WiFi.config() method but it won't connect to my MQTT broker.
Code: Select all
#include ESP8266Wifi.h
#include PubSubClient.h
IPAddress esp_ip(192,168,1,30);
IPAddress dns(192,168,1,22);
IPAddress subnet(255,255,255,0);
IPAddress gateway(192,168,1,1);
const char* broker = "mqtt"; //doesn't work
//IPAddress broker(192,168,1,24); //works fine
void callback(char* topic, byte* payload, unsigned int length){
}
WiFiClient wifiClient;
PubSubClient client(broker, 1883, callback, wifiClient);
void setup() {
WiFi.begin(ssid, password);
WiFi.config(esp_ip, dns, gateway, subnet);
//Wifi connects just fine
...
}
I've also tried the PubSubClient.setServer() method to no avail, the broker IP is not resolved and no connection is made. It works fine if I use an IPAddress variable instead of the char* to point out the broker. Can anyone help me?
