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Imroy / pubsubclient

A client library for the ESP8266 that provides support for MQTT
MIT License
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Error on connect code -2 #41

Open unixpapers opened 8 years ago

unixpapers commented 8 years ago

Hi!

Version: Arduino IDE 1.6.6 (and test 1.6.5), Arduino ESP8266 (2.0.0) when try to connect error -2. Try use anonymous too. Used tcpdump on Mosquitto server packages have. Have any ideas?

WiFi connected IP address: 192.168.1.3 Attempting MQTT connection...failed, rc=-2 try again in 5 seconds Attempting MQTT connection...failed, rc=-2 try again in 5 seconds

glen442 commented 8 years ago

For your info - from PubSubClient.h:

// Possible values for client.state() #define MQTT_CONNECTION_TIMEOUT -4 #define MQTT_CONNECTION_LOST -3 #define MQTT_CONNECT_FAILED -2 #define MQTT_DISCONNECTED -1 #define MQTT_CONNECTED 0 #define MQTT_CONNECT_BAD_PROTOCOL 1 #define MQTT_CONNECT_BAD_CLIENT_ID 2 #define MQTT_CONNECT_UNAVAILABLE 3 #define MQTT_CONNECT_BAD_CREDENTIALS 4 #define MQTT_CONNECT_UNAUTHORIZED 5

So your error seems to be that your connection has failed. This might be because of a connection problem (worth checking), or that the broker you are trying to connect to is on a different port/path.

I had a similar problem connecting to the Adafruit broker, but it turns out I wasn't building the 'topic' (path) correctly. So it was acting like there was a problem with the connection (presumably was returning http 400/300 type errors)