Digi ConnectPort X4 User's Guide download pdf (Page 170)

Configuration through the web interface

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Server Send Interval: Specifies how frequently the Device Cloud-registered

device sends a keep-alive packet to Device Cloud if the Device Cloud connection is

idle. Device Cloud expects to receive either Device Cloud protocol messages or

keep-alive packets from the Device Cloud-registered device at this interval.

Important: It is recommended that this interval value be set as long as your

application can tolerate to reduce the amount of data traffic.

Assume connection is lost after n timeouts (Wait Count): After the number of

consecutive expected keep-alives specified by this setting are missed according to

the configured intervals, the connection is considered lost and is closed by the

device and Device Cloud.

 Connection Method: Specifies the method by which the associated interface connects

to Device Cloud.

– TCP: Connect using TCP. This is the default connection method, and is typically good

enough for most connections. It is the most efficient method of connecting to Device

Cloud in terms of speed and transmitted data bytes.

Automatic: Automatically detect the connection method. This connection method

is less efficient than TCP, but it is useful in situations where a firewall or proxy may

prevent direct connection via TCP. Automatic will try each combination until a

connection is made. This connection method requires the HTTP over Proxy Settings

to be specified.

None: This value has the same effect as selecting TCP.

HTTP: Connect using HTTP.

HTTP over Proxy: Connect using HTTP.

HTTP over Proxy Settings: The settings required to communicate over a proxy

network using HTTP. These settings apply when Automatic or HTTP over Proxy

connection methods are selected.

Hostname: The name of the proxy host.

TCP Port: The network port number for the TCP network service on the proxy

host.

Username:

Password: The username and password for logging on to the proxy host.

Enable persistent proxy connections: Specifies whether the Device Cloud-

registered device should attempt to use HTTP persistent connections. Not all HTTP

proxies correctly handle HTTP persistent connections. The use of persistent

connections can improve performance of the exchange of messages between the

Device Cloud-registered device and Device Cloud, when that connection is HTTP/

proxy. The reason for this is that the same HTTP connection can be reused for

multiple consecutive HTTP requests and replies, eliminating the overhead of

establishing a new TCP connection for each individual HTTP request/reply, then

closing that connection when the request is complete.

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Digi ConnectPort X4 User's Guide Page 170