Error on connect code -2

[imroy]

Error on connect code -2

[glen442]

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)