exemys cLAN-MQ Series, Руководство пользователя

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Monitoring the cLAN-MQ to broker connection
Monitoring the connection in the cLAN-MQ
To verify whether the entered configuration into the cLAN-MQ is the correct one we have the possibility
of monitoring the status of the connection.
To access the monitoring screen of the configurator click on the “Monitor” button. Then, the following
screen will be displayed:
Link State
The TCP connection state can also be monitored. The possible TCP connection states are:
Disabled: The TCP connection has net been enabled. In this state the Link LED is off.
Connecting: The cLAN-MQ is attempting to establish a connection to the indicated IP address and
port. If the cLAN is not able to establish the TCP connection, the length of time in this state might
be an indication of a failure. If it remains in this state for a few seconds (less than 10), it might be
trying a connection to a closed port. If it maintains the state during a minute or more it might be
attempting to connect to a port and/or IP behind a firewall and is being filtered.
Connection Failed, Host Unreachable and Connection Refused: The 3 states imply that the
connection to the broker was not possible, but individually, they indicate the reason why they
occurred.
In general, each one has a specific motive although it depends on the TCP connection on the server
side for the indication to be correct, even so, any of the these 3 errors indicate a problem in the TCP
connection.
Connection Failed: This error appears when a connection to the configured IP is not
possible.
Host Unreachable: This happens when a connection to the IP is possible the port is open,
through the router or firewall, but there is nothing connected to that port.
Connection Refused: In this case the connection cannot be established because the
configured port is closed, this could happen because a router or firewall are blocking it.
Connected: The connection to the broker has been established.
DNS Failure : The cLAN can't convert the URL into an IP address. Check if the IP address is OK
and if the DNS servers are valid.
Error: The event occurs if the connection was not completed after a certain time and no other type
of failure was reported.
2020-11-19
cLAN-MQ User Manual cLAN-MQ to Broker connection
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