MQTT client not detecting disconnect

[erikkj]

We have an issue where the MQTT client is connected to server and all work fines. But if we stop the server, the client is not detecting that the server i offline. The client continues to send PING messages to server.

Keep alive is set to 30 seconds.

Any ideas?

Snippet from console log:

D (928349) MQTT_CLIENT: msg_type=13, msg_id=0
D (928349) MQTT_CLIENT: MQTT_MSG_TYPE_PINGRESP
D (943366) MQTT_CLIENT: Sent PING successful
D (943388) MQTT_CLIENT: msg_type=13, msg_id=0
D (943388) MQTT_CLIENT: MQTT_MSG_TYPE_PINGRESP
D (959000) MQTT_CLIENT: Sent PING successful
D (974018) MQTT_CLIENT: Sent PING successful
D (989034) MQTT_CLIENT: Sent PING successful
D (1004050) MQTT_CLIENT: Sent PING successful
D (1019066) MQTT_CLIENT: Sent PING successful
D (1034082) MQTT_CLIENT: Sent PING successful