Sierra Wireless WISMO218 User Manual download pdf (Page 16)

WA_DEV_W228_UGD_002 Rev 003 Page 16 of 78

WISMO228 TCP/IP AT Commands

Manual

of the network, then the datagram is divided into smaller fragments. These

divided fragments are sent separately. This option specifies the Time to live for

these fragments.

range: 1-65535 (default value: 60)

WIP_NET_OPT_TCP_MAXINITWIN  Number of segments of initial TCP

window

This option is used to specify the number of segments in the initial TCP window.

A TCP window specifies the amount of outstanding (unacknowledged by the

recipient) data a sender can send on a particular connection before it gets an

acknowledgment back from the receiver. The primary reason for the window is

congestion control.

range: 0-65535 (default value: 0)

WIP_NET_OPT_TCP_MIN_MSS - Default MSS of off-link connections

This parameter specifies the maximum size of TCP segments which would be

sent. By default, the value of this parameter is set to 536. Hence, the firmware

would not send any TCP segment having a length greater than 536 bytes

without a header.

range: 536-1460 (default value: 536)

WIP_NET_OPT_DEBUG_PORT

This option is used to specify the port on which the debug traces are to be sent.

range: 0-3 (default value: 0)

AT_WIP_NET_OPT_PREF_TIMEOUT_VALUE - Used for TCP sockets to

configure the packet segmentation on the IP network side

This option allows the application to buffer a certain amount of data before

writing on the IP network side.

Each unit in the range represents 100 msec. For example, a value of 10 for this

option will give a wait time of 1sec (10 *100mesc).

Default value for this option is 0. This value means that no specific process is

done to avoid TCP packets segmentation: data are written onto the IP network

without any delay after the reception of data. In this case, some TCP packets sent

on the IP network may be smaller than TCP_MIN_MSS value.

As mentioned above, setting a value of 10 for this option will make the

application wait at least 1 second or twice the TCP_MIN_MSS value to be

reached before sending data on the IP network. In this case, TCP packets size

sent on the IP network should be equal to at least TCP_MIN_MSS (Default value

= 536 bytes).

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Sierra Wireless WISMO218 User Manual Page 16