Retransmission Period (RP) setting

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Description (see setting description format info here)


Function:Defines the retransmission period for TCP packets


Set (S) command format:SRPttt, where ttt is retransmission period in 0.5 second intervals, 1-255


Get (G) command format:GRP


Init (I) command effect:Initialized unconditionally, through network command, serial command, or quick initialization


Post-initialization value:6 (3 seconds)


Change takes effect:After reboot


Overriding parameter:---


Relevance conditions:Current Transport Protocol (TP) [setting/ parameter]= 1 (TCP)


First introduced:[V3.34/V3.66+]


See also:TCP Data Connections




Packet retransmission is a standard feature of TCP/IP protocol. Whenever a particular packet with data is lost the sender is supposed to retransmit this packet after a certain delay. Standard TCP implementations use variable delays that increase exponentially after each unsuccessful retry. Tibbo devices use a fixed delay specified, in 0.5 second  intervals, by the Retransmission Period.

Default retransmission period works fine on most networks. Setting it to higher value may improve DS operation on networks with significant response delays, such as those including GPRS segments.

Retransmission Period is irrelevant when Current Transport Protocol (TP) [setting/ parameter] is 0 (UDP).