Retransmission Period (RP) setting


(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).