Sierra Wireless 20070914 Manual

A SERVICE OF

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Data Communication and Host Modes

Rev 3.0B Feb.08 67

• SettingtheStartupModeDefault(M D)to3(UDP)sothat

aUDPsessionisenteredautomaticallywhenthemodem

registersontothenetwork.Serialdatawillbesenttothe

IP/portspecifiedinS53.

IncomingUDPpacketswillbeprocessedouttheserialportif

• UDPautoanswerisenabled(S82=2);

• ThedestinationIPaddressmatchesthatinS53(ifFriends

Modeisenabled,theIPaddressalsoneedstobepresent

ontheFriendsList);

• OrallowanyIPisset(AIP=1);

• ThemodemisinATmode(notinacurrentUDPorTCP

session).

UDPpacketassemblyisaffectedbythevaluesofS50(PAD

ForwardingTime‐out)andS51(PADForwardingCharacter).

Datareceivedintheserialbufferwillbetransmittedwhenthe

idleinter‐charactertime‐outspecifiedinS50(intenthsof

seconds)occursorwhenacharacterisreceivedthatmatches



S51(ifnon‐zero).

UDP Auto Answer

UDPautoanswer(previouslycalledUDPhalf‐open)isset

withS82=2.Whenset,thePinPointXwillautomatically

establishaUDPsessiontothesourceIPaddressandportof

theUDPpacketreceived.ThePinPointXwillremain“locked”

tothisoneremoteIP/portuntilnodataissent

orreceivedfor

thetimeintervaldefinedintheUDPautoanswertime‐out

(S83).Duringthissession,packetsfromotherIP/port

addresseswillberejected,unless*UALLisset.Whetherornot

anincomingpacketwillcausethemodemtoenteraUDP

sessionisalwaysdependentonthe

S53andAIPsettings.

TheNormalUDPMode(MD3)canbecombinedwithUDP

autoanswertocausetheincomingserialdatatobesentin

UDPpackets(insteadofbeingtreat edasATcommands),while

allowingsessionstobeestablishedfromdifferentUDP

sources.AUDPsessionwillbeinitiatedeitherbyincoming

serial

dataorbyanincomingUDPpacket.Thesession,started

byeithermethod,willbeterminatedwhennodatahasbeen

sentorreceivedfortheS82period.Oncethesessiontermi

‐

nates,anothermaybeinitiatedbyeithermeans.

Whenidle,afterthetime‐outhasoccurred,themodemisinAT

commandmodeontheserialport,andanyvalidATcommand

maybeenteredduringthistime.