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Raven and PinPoint CDMA User Guide Version 1.12
AirLink Communications, Inc. Page 33 March 24, 2004
The TCP session will be terminated if no data is transmitted or received for the time
interval specified in TCPT and TCPS. TCPT is the number of minutes [TCPS=0] or
seconds [TCPS=1] used for this idle timeout.
TCPT should never be 0 when using the TCP mode. A broken TCP session can
result in the modem being left with a TCP half-open connection that can only be
terminated with a reset.
The host can also terminate a TCP session by deactivating DTR (if S211=0 or &D2)
or issuing the +++ escape sequence.
Note that DTR needs to be asserted (or S211=1 or &D0) by the host before a TCP
session can be started.
6.6 TCP Auto Answer
TCP auto answer (S0=1|2) also allows a TCP connection request to be “answered”
when the modem is idle, not in a data session. Note that DTR needs to be asserted (or
S211=1 or &D0) by the host before a TCP session can be entered. The TCP
connection request’s destination port has to match the modem’s device port.
Note that UDP auto answer may also be set simultaneously with TCP auto
answer. Then, when in the idle state, the modem will accept either a TCP
connection request or UDP incoming packet, and enter a TCP or UDP session as
appropriate.
6.7 Hybrid Modes
Some previous hybrid modes (MD=5, 6) are no longer implemented as special, unique
modes. Now that UDP auto answer (UDP Half-open, S82=2) can be enabled in
conjunction with UDP PAD mode (MD3), effectively this is the same as MD5 and
MD6 previously accomplished. Setting MD5 and MD6 are still supported, but not
recommended, since all they do is set several settings as described below.
The settings to accomplish hybrid modes:
AT
Setting
Hybrid
(MD5)
Hybrid2
(MD6)
MD
3
3
S82
2
2
S0
1
1
*UDPLAST
0
1