Hi my arduino client can't connect to the public broker test.mosquitto.com . The Serial Monitor output: Connecting to MQTT... failed state : -2 Here is the code, where is the problem?I don't find it : #include <PubSubClient.h> #include <Ethernet.h> #include <SPI.h> byte mac[] = {0xDE, 0xAD, 0x…

Connection problem to MQTT broker

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zakibdr March 12, 2019, 9:12pm 2

try with this broker
const char* mqtt_server ="broker.mqttdashboard.com"; and delette MQttuser and MQTTpassword
client.connect("ESP8266Client") it work

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Connection problem to MQTT broker

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