–
If AUTOUDP is enabled, cellular reconnection will happen automatically if the modem loses cellular IP address.
–
USB COM port is not available on the 2G model.
–
ONLY cellular PDP context # 1 will be used. Please setup +IPGPRS settings with <Cid>=1.
–
Once AUTOUDP is enabled, it will start the UDP socket connection automatically after 20 seconds.
–
Once the UDP connection is established successfully, the serial port will go to data mode, all data entered to
the serial port will be sent to remote UDP peer. No more AT commands will be accepted then.
–
In UDP connected data mode, the DSR and DCD signals of the serial port will go to high.
–
If UDP connection is broken the modem will try to reconnect automatically. During re-connection period serial
port will go back to command mode, and DSR/DCD signal back to low.
–
The setting will be saved, and after power off, the AUTOUDP will be restarted with the 20 seconds delay after
power up.
–
To stop AUTOUDP connection, you need to enter the command AT+AUTOUDP=0 either
1. within 20 seconds after power up,
2. during reconnection (serial port back to command mode),
3. or by SMS (see chapter 10).
–
Due to the nature of UDP socket connection, AT+AUTOUDP=0 may not be able to disconnect. in this case you
may send command AT+IPCONNECT=1,0 to disconnect cellular connection.
–
During AUTOUDP operation reset will happen in following cases:
1. If no GPRS connection successful for 2 minutes.
2. If failure to switch UART to Data mode.
3. If undefined condition occurs in connection errors/callback handlers.
3.2.3
Buffering time
AT+AUFCM
This command controls the buffering time of TCP/UDP data sent to remote peer when using automatic or AT com-
mand driven TCP/UDP connection.. Data coming from serial will be buffered for a "delay" period before being sent
out.
Syntax:
AT+AUFCM=<delay>
Response:
+AUFCM: <delay>
Defined Values:
<delay>
Delay units between sending buffered data to TCP/UDP peer. The actual delay time is calculated by the
value of <delay> times 18.5 ms. So if <delay> is equal to 2 that means data will be sent to remote peer
every 37ms (or immediately if internal buffer is full). Increasing this value can make the data packet size
bigger especially when data flow is slow, thus reducing overhead. Default value: 2. Possible value: 1 to
255.
Example:
Command
Response
AT+AUFCM=2
OK
Note: set the +AUFCM value to 2.
AT+AUFCM?
+AUFCM: 2
OK
AT+AUFCM=?
+AUFCM: (1-255)
OK
Confidential, the whole document is the sole property of Maestro Wireless Solutions ltd.
support@maestro-wireless.com
29
