Sierra Wireless 20070914 Cell Phone User Manual


 
Data Communication and Host Modes
Rev 3.0B Feb.08 56
SLIP
SLIPmodeisenteredbeusingtheAT\ASLIPcommand.As
inPPPMode,theIPaddressthatthehostassumesisaffected
bythesettingof*HOSTPRIVMODE.SLIPdoesnotnegotiate
theIPaddresswiththeconnecteddeviceorcomputer,so
beforemakingaSLIPconnection,theSLIPdriveron
that
deviceorcomputermustbeconfiguredtousetheIPaddress
specifiedbyqueryingS110.
UDP and UDP Pad
WhenthemodemisinUDPPAD(PacketAssemblyandDisas
sembly)Mode,allcharactersreceivedontheserialportare
assembledintoUDPpacketsandsenttotheremoteIP
address/portortheRaven,andanypacketsreceivedfromthe
sameIP/portdestinedforthedeviceportofRaven(see
*DPORT)‐‐aredisassembledanddumpedontotheserialline.
AUDPsessionisinitiatedbyoneofthe f ollowingevents:
UsingtheDialUDP(DP)ATcommand(example,
ATDP192.168.3.23/3456).
SettingtheStartupModeDefault(M D)to3(UDP)sothat
aUDPsessionisenteredautomaticallywhenthemodem
registersontothenetwork.Serialdatawillbesenttothe
IP/portspecifiedinS53.
IncomingUDPpacketswillbeprocessedouttheserialportif
UDPautoanswerisenabled(S82=2);
ThedestinationIPaddressmatchesthatinS53(ifFriends
Modeisenabled,theIPaddressalsoneedstobepresent
ontheFriendsList);
OrallowanyIPisset(AIP=1);
ThemodemisinATmode(notinacurrentUDPorTCP
session).
UDPpacketassemblyisaffectedbythevaluesofS50(PAD
ForwardingTimeout)andS51(PADForwardingCharacter).
Datareceivedintheserialbufferwillbetransmittedwhenthe
idleintercharactertimeoutspecifiedinS50(intenthsof
seconds)occursorwhenacharacterisreceivedthatmatches
S51(ifnonzero).
UDP Auto Answer
UDPautoanswer(previouslycalledUDPhalfopen)isset
withS82=2.Whenset,theRavenwillautomaticallyestablisha
UDPsessiontothesourceIPaddressandportoftheUDP
packetreceived.TheRavenwillremain“locked”tothisone