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User’s Guide 
 
AT Command Reference 
 
2110212 Rev 1.0 
 
Page 115 
 
Table 12-5:  WS-Registers in CDPD Mode (continued) 
Register Description 
Range 
Default 
Units 
214 
Booster Enable 
The DART 300 is capable of supporting the Sierra Wireless 
AirBooster 350 RF amplifier.  This register can disable the 
modem’s recognition of the amplifier for test purposes. 
Value Meaning 
0 Disabled 
1 
Enabled  (Default) 
0, 1 
 
216 
Auto-dial on Start-up 
When TCP or UDP PAD mode is used, the modem can 
initiate a client session upon power-up or reset.  When 
enabled, this feature will “quick dial” the IP address and port 
stored in the Friends List at the index contained in 
+WS213 (Friend List Index). 
If the connection attempt would return a failure result code, 
the modem will retry the dial command indefinitely.  No 
result codes are returned to the local host.  The modem 
appears to be in data state from the power-up or reset. 
Value Meaning 
0 
Disabled  (Default) 
1 Enabled 
0, 1 
 
217 
UDP Server Receive Lock 
Controls the handling of packets from multiple clients when 
acting as a UDP server. 
When this register is set to 0 (the default), the receive lock is 
disabled.  The modem will only accept packets from the 
calling client’s IP and port until the session is closed.  Packets 
from other callers are dropped.  See Section 6.2.1.2 for a full 
discussion. 
If the value is non-zero, the modem will accept packets from 
other clients but hold them based on the locking time set in 
this register. 
The modem will queue client packets, expecting the local host 
to respond to each client in turn.  As each response is sent, or 
the timer expires, the next client’s packets are delivered to the 
local host, up to a packet from yet another new caller.  A new 
lock is set and the timer restarts. 
Packets are delivered in the order they are received.  If more 
than one packet arrives from a given client, those packets that 
arrive without intervening ones from another source will be 
delivered the host as a set.  Only one response is needed to 
clear the lock and allow the next client’s packet(s) through. 
If packets arrive from the currently active client while the 
local host has not replied, and the modem has not received 
packets from other clients, they will be delivered to the local 
host immediately.  Buffering of packets begins with the first 
packet from a client other than the active one.  From that point 
all packets from any client are held back (buffered) pending 
release of the lock. 
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