Multitech MMCModem MTMMC-G-F4 User manual

Wireless GPRS-F4 Modems
with IP Connectivity
MultiModem®GPRS (MTCBA-G-F4)
MMCModem™GPRS (MTMMC-G-F4)
SocketModem®GPRS (MTSMC-G-F4)
IP Connectivity AT Commands
Reference Guide

Copyright and Technical Support
Multi-Tech Systems, Inc. IP Connectivity AT Commands for GPRS-F4 Wireless Modems (PN S000437E) 2
IP Connectivity AT Commands for Wireless GPRS-F4 Modems
Reference Guide
Products that use these commands:
MultiModem®GPRS (MTCBA-G-F4)
MMCModem™GPRS (MTMMC-G-F4)
SocketModem®GPRS (MTSMC-G-F4)
S000437E
Copyright
This publication may not be reproduced, in whole or in part, without prior expressed written permission from Multi-
Tech Systems, Inc. All rights reserved. Copyright © 2007-2008, by Multi-Tech Systems, Inc.
Multi-Tech Systems, Inc. makes no representations or warranty with respect to the contents hereof and specifically
disclaim any implied warranties of merchantability or fitness for any particular purpose. Furthermore, Multi-Tech
Systems, Inc. reserves the right to revise this publication and to make changes from time to time in the content hereof
without obligation of Multi-Tech Systems, Inc. to notify any person or organization of such revisions or changes.
Revisions
Revision Level Date Description
A05/17/07 Initial release. Based on Wavecom IP WIPSoft V2.02 commands.
B 08/16/07 Updated the +WIND command in Appendix A.
C 01/16/08 Updated the cover page and updated the product name of the MMCModem.
D 03/11/08 Updated for Wavecom IP WIPSoft commands, version 3.11.
E 05/09/08 Add +WOPEN command (open the TCP/IP stack).
Trademarks
SocketModem®, MultiModem®, Multi-Tech®, and the Multi-Tech logo are registered trademarks of Multi-Tech
Systems, Inc. MMCModem is a trademark of Multi-Tech Systems, Inc.
WAVECOM®, WISMO®, Open AT® and certain other trademarks and logos appearing on this document, are filed or
registered trademarks of Wavecom S.A. in France or in other countries. All other company and/or product names
mentioned may be filed or registered trademarks of their respective owners.
Technical Support
Country By Email By Phone
Europe, Middle East, Africa: [email protected] (44) 118 959 7774
U.S., Canada, all others: [e-mail] [phone] or 1-763-717-5863
World Headquarters
Multi-Tech Systems, Inc.
2205 Woodale Drive
Mounds View, Minnesota 55112
Phone: [phone] or 800-328-9717
Fax: [phone]
Internet Address: http://www.multitech.com

Table of Contents
Multi-Tech Systems, Inc. IP Connectivity AT Commands for GPRS-F4 Wireless Modems (PN S000437E) 3
Table of Contents
Chapter 1 – Introduction .............................................................................................................................. 4
Acronyms and Abbreviations..................................................................................................................... 4
AT Command Syntax ................................................................................................................................ 5
Command Line .......................................................................................................................................... 5
Information Responses and Result Codes................................................................................................ 5
Principles ................................................................................................................................................... 5
Socket Identification .................................................................................................................................. 6
Getting Started .......................................................................................................................................... 6
Open the TCP/IP Stack ............................................................................................................................. 6
Chapter 2 – General Configuration AT Commands .................................................................................. 7
IP Stack Handling +WIPCFG .................................................................................................................... 7
Bearers Handling +WIPBR...................................................................................................................... 13
Chapter 3 – IP Protocol Services .............................................................................................................. 18
Service Creation +WIPCREATE ............................................................................................................. 18
Closing a Service +WIPCLOSE .............................................................................................................. 24
Service Option Handling +WIPOPT ........................................................................................................ 26
Chapter 4 – Data Exchange for Protocol Services.................................................................................. 30
File Exchange +WIPFILE ........................................................................................................................ 30
Socket Data Exchange +WIPDATA ........................................................................................................ 36
Chapter 5 – Ping Services ......................................................................................................................... 43
PING Command +WIPPING .................................................................................................................. 43
Chapter 6 – Application Examples............................................................................................................ 45
TCP Socket ............................................................................................................................................. 45
TCP Client Socket ................................................................................................................................... 47
UDP Socket ............................................................................................................................................. 49
PING........................................................................................................................................................ 51
FTP .......................................................................................................................................................... 52
HTTP ....................................................................................................................................................... 53
SMTP....................................................................................................................................................... 54
POP3 ....................................................................................................................................................... 55
Creating a TCP Server ............................................................................................................................ 56
Create UDP Sockets, TCP Clients, & TCP Servers................................................................................ 57
Change the MAX_SOCK_NUM Option Value......................................................................................... 60
Create UDP Sockets, TCP Clients, TCP Servers & 1 FTP, etc. Session ............................................... 62
Subscribe/Unsubscribe WIPSoft AT Commands .................................................................................... 66
Chapter 7 – Error Codes ............................................................................................................................ 67
Appendix A – GSM/GPRS +WIND Command........................................................................................... 69
General Indications +WIND................................................................................................................... 69
Index............................................................................................................................................................. 72

Chapter 1 – Introduction
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Chapter 1 – Introduction
Acronyms and Abbreviations
APN Access Point Name
ASCII American Standard Code for Information Interchange
AT ATtention
BBC Blind Carbon Copy
CC Carbon Copy
CHAP Challenge Handshake Authentication Protocol
CHV Card Holder Verification
CID Context IDentifier
CMUX Converter Multiplexer
CPU Central Processing Unit
DNS Domain Name System
GGSN Gateway GPRS Support Node
GPRS General Packet Radio Service
GSM Global System for Mobile communicatio006E
HTTP Hyper Text Transfer Protocol
IP Internet Protocol
IPCP Internet Protocol Control Protocol
M Mandatory
MS Mobile Station
N/A Not Applicable
MSCHAP Microsoft Challenge Handshake Authentication
MSS Maximum Segment Size
NU Not Used
O Optional
OS Operating System
PAP Password Authentication Protocol
PDP Packet Data Protocol
PIN Personal Identity Number
POP3 Post Office Protocol
PPP Point-to-Point Protocol
SIM Subscriber Information Module
SMTP Simple Mail Transfer Protocol
TCP Transmission Control Protocol
TOS Type Of Service
TTL Time To Live
UART Universal Asynchronous Receiver Transmitter
UDP User Data Protocol
URL Uniform Resource Locator
WIP Wavecom Internet Protocol

Chapter 1 – Introduction
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AT Command Syntax
Command Line
Commands always start by the standard prefix AT+WIP and end with the <CR> character. Optional
parameters are shown in brackets [ ].
Example:
AT+WIPcmd=<Param1>[,<Param2>]
<Param2> is optional. When the AT+WIP command is executed without <Param2> the default value
of <param2> is used.
Information Responses and Result Codes
Responses start and end with <CR><LF>, except for the ATV0 DCE response format and the ATQ1
(result code suppression) commands.
•If the command syntax is incorrect, the ERROR string is returned.
•If the command syntax is correct but transmitted with the wrong parameters, the +CME
ERROR: <Err> string or the +CMS ERROR: <SmsErr> string is returned with adequate error
codes if CMEE was previously set to 1. By default, CMEE is set to 0, and the error message
is only ERROR.
•If the command line has been executed successfully, an OK string is returned.
In some cases, such as AT+CPIN? or (unsolicited) incoming events, the product does not return the
OK string as a response.
In the following examples <CR> and <CR><LF> are intentionally omitted.
Principles
WIPSoft is an Open AT® application that implements the TCP/IP protocols using custom AT
commands. This Open AT® application operates in co-operative mode and must be downloaded to
the Wavecom Wireless CPU®. The commands are sent from an external application and the
corresponding responses are sent back from the Wavecom Wireless CPU® to the external
application. WIPSoft uses the APIs provided by wipLib and provides custom AT command interface to
the external application.
AT+WIP commands involve:
•A host computer, which issues AT+WIP commands
•Wavecom’s wireless CPU®
•The rest of the Internet / Intranet
AT Commands
Wavecom
WCPU
Host
CPU UART INTERNET

Chapter 1 – Introduction
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Multiplexing: Several sockets can be operating at once. The +WIPDATA command allows to
temporarily identify the UART in data mode with a given socket. The data written on UART is
transferred through the socket. The data which arrives on the socket can be read from the
UART. In AT mode, the host receives an unsolicited event when the data arrives on the socket.
Multiple UARTs: There can be several UARTs simultaneously active at once, and different
UARTs can map a different socket simultaneously. However, you cannot map a single socket
on several UARTs simultaneously.
Socket Identification
Sockets are identified by a pair of numbers: the first one identifies the protocol; the second one
identifies a given socket of this protocol.
Possible Protocols
The possible protocols are:
•1 = UDP
•2 = TCP in connect mode (Client)
•3 = TCP in listen mode (Server)
•4 = FTP
•5 = HTTP
•6 = SMTP
•7 = POP3
Two pairs with a different protocol number but the same index identify two distinct sockets.
Example: Both 1,7 and 2,7 are valid identifiers simultaneously; the former identifies a UDP socket
and the later, a TCP connected socket.
Number of Sockets
The number of sockets per protocol is limited.
•UDP: 8 sockets
•TCP Clients: 8 sockets
•TCP Servers: 4 sockets
Getting Started
Open the TCP/IP Stack
Use the following command to open the TCP/IP stack:
AT+WOPEN=1 Open the TCP/IP Stack
If WOPEN is set to 0, the TCP/IP stack is not opened. In some instances, this may be the
default setting.

Chapter 2 – General Configuration AT Commands
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Chapter 2 – General Configuration AT
Commands
Important Note: Before you can use any of these commands, you must open the TCP/IP stack. Use the
following command: AT+WOPEN=1 Open the TCP/IP Stack
IP Stack Handling +WIPCFG
Description: The +WIPCFG command is used for performing the following operations:
•Starts TCP/IP stack
•Stops TCP/IP stack
•Configures TCP/IP stack
•Displays version information
Description Notes:
•This command can be used even if the SIM card is absent.
•The +WIND indication from which this command is allowed is 3, which
provides information about the SIM presence after a software reset and also
indicates whether the SIM is inserted or removed. See Appendix A –
GSM/GPRS +WIND AT Command.
Command Syntax: If <mode>=0, 1 AT+WIPCFG=<mode>
Response OK
If <mode>=2 AT+WIPCFG=<mode>,<opt num>,<value>
Response OK
If <mode>=3 AT+WIPCFG=<mode>
Response WIP soft vXX.YY.ZZ on Open AT OS vA.B
OK
If <mode>=4 AT+WIPCFG=<mode>,<action>
Response OK
Read Syntax: AT+WIPCFG? Response <optnum> and <value>
Test Syntax: AT+WIPCFG=? Response OK
Parameters/Defined Values:
<mode> Requested Operation
0 stop TCP/IP stack
1 start TCP/IP stack
2 configure TCP/IP stack
3 display TCP/IP application version
4 TCP/IP stack configuration management
<opt num> Configuration Option Identifier
0 WIP_NET_OPT_IP_TTL – Default TTL of outgoing data grams
This option is a limit on the period of time or number of iterations or
transmissions that a unit of data can experience before it should be
discarded. The time to live (TTL) is an 8-bit field in the Internet Protocol
(IP) header. It is the 9th octet of 20. The default value of this parameter is
64. Its value can be considered as an upper bound on the time that an IP
datagram can exist in an internet system. The TTL field is set by the
sender of the datagram, and reduced by every host on the route to its
destination. If the TTL field reaches zero before the datagram arrives at its
destination, then the datagram is discarded. This is used to avoid a
situation in which an undelivered datagram keeps circulating in the
network.
Range: 0-255 (default value: 64)

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IP Stack Handling +WIPCFG Continued
1 WIP_NET_OPT_IP_TOS – Default TOS of outgoing parameters.
The IP protocol provides a facility for the Internet layer to know about the
various tradeoffs that should be made for a particular packet. This is
required because paths through the Internet vary widely in terms of the
quality of service provided. This facility is defined as the "Type of Service"
facility, abbreviated as the "TOS facility".
The TOS facility is one of the features of the Type of Service octet in the IP
datagram header. The Type of Service octet consists of following three
fields:
0 1 2 3 4 5 6 7
+-----+-----+-----+-----+-----+-----+-----+-----+
| | | |
| PRECEDENCE | TOS | MBZ |
| | | |
+-----+-----+-----+-----+-----+-----+-----+-----+
The first field is "PRECEDENCE". It is intended to denote the importance
or priority of the datagram.
The second field is "TOS" which denotes how the network should maintain
the tradeoffs between throughput, delay, reliability, and cost.
The last field is "MBZ" (Must Be Zero"), is currently unused and is set to 0.
The TOS field can have the following values:
1000 -- minimize delay
0100 -- maximize throughput
0010 -- maximize reliability
0001 -- minimize monetary cost
0000 -- normal service
Range: 0-255 (default value: 0)
2 WIP_NET_OPT_IP_FRAG_TIMEO – Time to live in seconds of
incomplete fragments.
When a datagram’s size is larger than the MTU (Maximum Transmission
Unit) of the network, then the datagram is divided into smaller fragments.
These divided fragments are sent separately. The
“WIP_NET_OPT_IP_FRAG_TIMEO” option specifies the Time to live for
these fragments.
Range: 1-65535 (default value: 60)
3 WIP_NET_OPT_TCP_MAXINITWIN – Number of segments of initial
TCP window.
This option is used to specify the number of segments in the initial TCP
window.
A TCP window specifies the amount of outstanding (unacknowledged by
the recipient) data a sender can send on a particular connection before it
gets an acknowledgment back from the receiver. The primary reason for
the window is congestion control.
Range: 0-65535 (default value: 0)
4 WIP_NET_OPT_TCP_MIN_MSS – Default MSS of off-link connections
This option is used by the Open AT Plug-in WIP Lib internally. This
parameter specifies the maximum size of TCP segment which would be
sent. By default, the value of this parameter is set to 536. Hence Open AT
Plug-in WIP Lib would not send any TCP segment having a length greater
than 536 bytes without header.
Range: 536-1460 (default value: 536)

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IP Stack Handling +WIPCFG Continued
5 WIP_NET_OPT_DEBUG_PORT
This option is used to specify the port on which the debug traces are to be
sent.
Range: 0-3 (default value: 0)
6 WIP_NET_OPT_SOCK_MAX – Total number of sockets (TCP and
UDP)
This option specifies the maximum number of TCP and UDP sockets that
can be created at one particular time.
Range: 1-23 (default value: 20)
7 WIP_NET_OPT_BUF_MAX – Total number of network buffers
The total number of network buffers which will be used that can be
specified using this option.
Range: 4-42 (default value: 32)
8 WIP_NET_OPT_IP_MULTI_MAX – Total number of multicast group
Caution: The option WIP_NET_OPT_IP_MULTI_MAX is read only
parameter.
Multicast is the delivery of information to a group of destinations
simultaneously, using the most efficient strategy to deliver the messages
over each link of the network only once. IP Multicast is a technique for
many-to-many communication over an IP infrastructure. An IP Multicast
group address is used by sources and the receivers to send and receive
content. Sources use the group address as the IP destination address in
their data packets. Receivers use this group address to inform the network
that they are interested in receiving packets sent to that group. For
example, if some content is associated with group 239.1.1.1, the source
will send data packets destined to 239.1.1.1. Receivers for that content
will inform the network that they are interested in receiving data packets
sent to the group 239.1.1.1. This option is used to set the total number of
multicast group.
9 WIP_NET_OPT_IP_ROUTE_MAX – Size of IP routing table
The Routing tables refer to a database on a router which is used to store
that routers' information on the topology of the network. This option is used
to specify the size of the routing table.
Range: 0-2730 (default value: 0)
10 WIP_NET_OPT_RSLV_QUERY_MAX – Maximum number of DNS
resolver queries
This option specifies the maximum number of DNS queries that will be sent
to the DNS server. This option is used if the IP address is specified as
alphanumeric string.
Range: 1-511 (default value: 4)
11 WIP_NET_OPT_RSLV_CACHE_MAX – Size of DNS resolver cache
It allows to set the maximum size of the DNS resolver cache. The size of
the cache is maintained by the WIP library.
Range: 1-292 (default value: 4)
12 AT_WIP_NET_PREF_TIMEOUT_VALUE – Used for TCP sockets to
configure the packet segmentation on IP network side
This option is used to specify the maximum time to wait between two
successive data chunks received from the mapped UART/serial port
(please see +WIPDATA AT command). It allows the application to buffer a
certain amount of data before writing on IP network side.
Each unit in the range represents 100 msec. For example, value 10 for this
option will give a wait time of 1sec (10 *100mesc).

Chapter 2 – General Configuration AT Commands
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IP Stack Handling +WIPCFG Continued
Default value for AT_WIP_NET_OPT_PREF_TIMEOUT_VALUE option is
0.
This value means that no specific process is done to avoid TCP packets
segmentation: data are written onto IP network without any delay after the
reception of data from the mapped UART/serial port (please see
+WIPDATA AT command). In this case some TCP packets sent on the IP
network may be smaller than TCP_MIN_MSS value.
Setting e.g. a 10 value for this option will make the application to wait at
least 1 second or twice the TCP_MIN_MSS value to be reached before
sending data on IP network. In this case, TCP packets size sent on the IP
network should be equal to at least TCP_MIN_MSS (Default value = 536
bytes).
Range: 0 – 100 (default value: 0)
<action> Requested operation on TCP/IP stack parameter management
0 Configuration storage (when existing) is freed
1 Stores the configuration parameters
<value> Value range for different configuration options
<XX.YY.ZZ> WIP soft release version
<A.B> Open AT® OS release version
Parameter Storage: Only one IP stack configuration set can be saved into the FLASH memory.
•AT+WIPCFG=4,1 is used to store the TCP/IP stack configuration
parameters into the FLASH memory
•AT+WIPCFG=4,0 is used to free the TCP/IP stack configuration storage
Executing AT+WIPCFG=1 will apply default parameters when existing. Still, it is
possible to change option values at run time using
AT+WIPCFG=2,<optnum>,<optvalue>.
Possible Errors: The possible error message is displayed only if “AT+CMEE=1” is activated else
“ERROR” is displayed.
+CMEE AT error
code
Description
800 invalid option
801 invalid option value
802 not enough memory left
820 error writing configuration in FLASH
memory
821 error freeing configuration in FLASH
memory
844 stack already started
850 initialization failed

Chapter 2 – General Configuration AT Commands
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IP Stack Handling +WIPCFG Continued
Examples:
Command Responses
AT+WIPCFG=1
Note: Start IP Stack
OK
AT+WIPCFG? +WIPCFG: 0,64
+WIPCFG: 1,0
+WIPCFG: 2,60
+WIPCFG: 3,0
+WIPCFG: 4,536
+WIPCFG: 5,0
+WIPCFG: 6,8
+WIPCFG: 7,32
+WIPCFG: 8,0
+WIPCFG: 9,0
+WIPCFG: 10,4
+WIPCFG: 11,4
+WIPCFG: 12,10
OK
AT+WIPCFG=2,0,10
Note: Configure TTL of the IP Stack
OK
AT+WIPCFG? +WIPCFG: 0,10
+WIPCFG: 1,0
+WIPCFG: 2,60
+WIPCFG: 3,0
+WIPCFG: 4,536
+WIPCFG: 5,0
+WIPCFG: 6,8
+WIPCFG: 7,32
+WIPCFG: 8,0
+WIPCFG: 9,0
+WIPCFG: 10,4
+WIPCFG: 11,4
+WIPCFG: 12,10
OK
AT+WIPCFG=3
Note: Display software version
WIP soft v202 on Open AT OS
v312
Mar 26 2007 11:45:46
WIPlib:v2a07 WIPSoft:v1a12
OK
AT+WIPCFG=0
Note: Stop the TCP/IP Stack
OK
AT+WIPCFG=4,1
Note: Store IP configuration parameters into FLASH
OK
AT+WIPCFG=4,0
Note: Free IP configuration parameters stored in
FLASH
OK

Chapter 2 – General Configuration AT Commands
Multi-Tech Systems, Inc. IP Connectivity AT Commands for GPRS-F4 Wireless Modems (PN S000437E) 12
IP Stack Handling +WIPCFG Continued
Notes
It is recommended to change the default settings of the WIP stack using +WIPCFG only when it
is required. Changing the parameter values especially the max number of sockets and the max
TCP buffer size with the high values lead to over consumption of the stack memory which causes
the WIP Soft to crash. Hence, care must be taken when the default settings of the stack is
changed using +WIPCFG command.
Following option values set by +WIPCFG command are taken into consideration at the run time.
The below option values except for AT_WIP_NET_OPT_PREF_TIMEOUT_VALUE will be taken
into consideration at next start up only if these are saved in the flash before stopping the stack.
•WIP_NET_OPT_IP_TTL
•WIP_NET_OPT_IP_TOS
•WIP_NET_OPT_IP_FRAG_TIMEO
•WIP_NET_OPT_TCP_MAXINITWIN
•WIP_NET_OPT_TCP_MIN_MSS
•WIP_NET_OPT_DEBUG_PORT
•AT_WIP_NET_OPT_PREF_TIMEOUT_VALUE
Following option values set by +WIPCFG command are taken into consideration in the next start
up only if these are saved in the flash before stopping the stack.
•WIP_NET_OPT_SOCK_MAX
•WIP_NET_OPT_BUF_MAX
•WIP_NET_OPT_IP_ROUTE_MAX
•WIP_NET_OPT_RSLV_QUERY_MAX
•WIP_NET_OPT_RSLV_CACHE_MAX

Chapter 2 – General Configuration AT Commands
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Bearers Handling +WIPBR
Bearers Handling +WIPBR
Description: The +WIPBR command can be used to:
•Select the bearer
•Start/close the bearer
•Configure different bearer options such as access point name
Description Notes:
•The SIM card must be inserted in order to use this command.
•This command can be used even if the PIN 1/CHV 1 is not entered.
•This command can be used even if the PIN 2/CHV 2 is not entered.
Command Syntax: If <cmdtype>=0,1 or 5 AT+WIPBR=<cmdtype>,<bid>
Response OK
If <cmdtype>=2 AT+WIPBR=<cmdtype>,<bid>,<opt num>,<value>
Response OK
If <cmdtype>=3 AT+WIPBR=<cmdtype>,<bid>,<opt num>
Response OK
If <cmdtype>=4 AT+WIPBR=<cmdtype>,<bid>,<mode>[,<login>,
<password>,[<caller identity>]]
Response OK
If <cmdtype>=6 AT+WIPBR=<cmdtype>,<bid>,<mode>
Response OK
Read Command: AT+WIPBR? Reads current values.
Response <bid>,<state>
[<bid>,<state>[..]]
OK
Test Command: AT+WIPBR=? Lists available values
Response OK
Unsolicited Response: If <mode>=1 +WIPBR: <bid>,<status>,<local IP @>,<remote IP @>,<DNS1
@>, <DNS2 @>
Parameters/
Defined Values: <cmd type> Type of Command
0 close bearer
1 open bearer
2 set value of different bearer options
3 get value of different bearer options
4 start bearer
5 stop bearer
6 bearer configuration management
<bid> Bearer Identifier
1 UART1
2 UART2
3 N/A
4 N/A
5 GSM
6 GPRS
11..14 CMUX port over UART1
21..24 CMUX port over UART2
<opt num> Bearer Option Identifier
0 WIP_BOPT_LOGIN
username (string)
max: 64 characters
1 WIP_BOPT_PASSWORD
password (string)
max: 64 characters

Chapter 2 – General Configuration AT Commands
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Bearers Handling +WIPBR continued
2 WIP_BOPT_DIAL_PHONENB
phone number (string)
max: 32 characters
5 WIP_BOPT_DIAL_RINGCOUNT
Number of rings to wait before sending the
WIP_BEV_DIAL_CALL event
range: 0-65535
6 WIP_BOPT_DIAL_MSNULLMODEM
Enable MS-Windows null-modem protocol ("CLIENT"/"SERVER"
handshake)
range: 0-1
7 WIP_BOPT_PPP_PAP
Allow PAP authentication
range: 0-1
8 WIP_BOPT_PPP_CHAP
Allow CHAP authentication
range: 0-1
9 WIP_BOPT_PPP_MSCHAP1
Allow MSCHAPv1 authentication
range: 0-1
10 WIP_BOPT_PPP_MSCHAP2
Allow MSCHAPv2 authentication
range: 0-1
11 WIP_BOPT_GPRS_APN
Address of GGSN (string)
max: 96 characters
12 WIP_BOPT_GPRS_CID
CID of the PDP context
range: 1-4
13 WIP_BOPT_GPRS_HEADERCOMP
Enable PDP header compression
range: 0-1
14 WIP_BOPT_GPRS_DATACOMP
Enable PDP data compression
range: 0-1
15 WIP_BOPT_IP_ADDR
Local IP address (IP/string)
16 WIP_BOPT_IP_DST_ADDR
Destination IP address (IP/string)
17 WIP_BOPT_IP_DNS1
Address of primary DNS server
(IP/string)
18 WIP_BOPT_IP_DNS2
Address of secondary DNS server
(IP/string)
19 WIP_BOPT_IP_SETDNS
Configure DNS resolver when connection is established
range: 0-1
20 WIP_BOPT_IP_SETGW
Set interface as default gateway when connection is established
range: 0-1
<value>: range of value for different bearer options
<mode>: mode of operation
0 client
1 server
<state>: current state of the bearer
0 stopped
1 started

Chapter 2 – General Configuration AT Commands
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Bearers Handling +WIPBR Continued
<status>: result of the connection process
0 successful
any other value: to be matched to error code value (e.g., “814”
means PPP authentication failure)
<local IP @*>: local IP address
<remote IP @*>: remote IP address. (first node in internet)
<DNS1 IP @*>: Domain Name Server address
<DNS2 IP @*>: Domain Name Server address
<login>: PPP login
<passwd>: PPP password
<caller identity>: optional ASCII string (type ascii*).
If not specified, then target will accept all DATA calls
(independently of caller identification). If specified, then target
will only accept calls from <caller identity> (which are the GSM
data call number of the GSM client).
*IP @ are displayed in alpha numeric dot format. e.g. 192.168.0.1…When no IP
address is known, “0.0.0.0“ is displayed.
Caution: The options WIP_BOPT_IP_DST_ADDR, WIP_BOPT_IP_DNS1 and
WIP_BOPT_IP_DNS2 are “read only” for GPRS/GSM client
Parameter Storage
Several bearer configuration set can be saved.
Calling twice AT+WIPBR=6,<bid>,1 with the same <bid> will store the last
configuration set.
•AT+WIPBR=6,<bid>,1 is used to store the bearer configuration parameters set
associated with the bearer <bid> into the FLASH memory.
•AT+WIPBR=6,<bid>,0 is used to free the bearer configuration parameters set
associated with the bearer <bid>.
Executing AT+WIPBR=1,<bid> will open bearer <bid> with default parameters of
the bearer when existing.
Possible Errors
The possible error message is displayed only if “AT+CMEE=1” is activated else
“ERROR” is displayed.
+CMEE AT
error code
Description
800 invalid option
801 invalid option value
802 not enough memory left
803 already open
804 not available on this platform
807 bearer connection failure: line busy
808 bearer connection failure: no answer
815 bearer connection failure: PPP authentication failed
816 bearer connection failure: PPP IPCP negotiation failed
820 error writing configuration in FLASH memory
821 error freeing configuration in FLASH memory

Chapter 2 – General Configuration AT Commands
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Bearers Handling +WIPBR Continued
Examples
Command Responses
AT+WIPBR? 1,0
6,1
OK
Note: Bearer UART1 is open but not
started bearer GPRS is open and
started
AT+WIPBR? OK
Note: No bearer has been opened yet
AT+WIPBR=1,6
Note: Open GPRS bearer
OK
AT+WIPBR=2,6,11,”APN name”
Note: Set APN of GPRS bearer
OK
AT+WIPBR=3,6,11
Note: Get APN of GPRS bearer
+WIPBR: 6,11,”APN name”
OK
AT+WIPBR=4,6,0
Note: Start GPRS bearer
OK
AT+WIPBR=5,6
Note: Stop GPRS bearer
OK
AT+WIPBR=0,6
Note: Close GPRS bearer
OK
AT+WIPBR=1,5
Note: Open GSM bearer
OK
AT+WIPBR=2,5,0,"login"
Note: Set the login for GSM bearer
OK
AT+WIPBR=2,5,1,"password"
Note: Set the password for GSM bearer
OK
AT+WIPBR=2,5,2,"phonenumber"
Note: Set the phone number for GSM bearer
OK
AT+WIPBR=2,5,15,"1.1.1.1"
Note: Set the local IP address for GSM bearer
OK
AT+WIPBR=2,5,16,"2.2.2.2"
Note: Set the destination IP address for GSM
bearer
OK
AT+WIPBR=3,5,15
Note: Read the local IP address for GSM bearer
+WIPBR: 5,15,"0.0.0.0"
OK
Note: Local IP address is not set as
GSM bearer and is still not connected
AT+WIPBR=3,5,16
Note: Read the destination IP address for GSM
bearer
+WIPBR: 5,16,"0.0.0.0"
OK
Note: Destination IP address is not set
as GSM bearer and is still not
connected
AT+WIPBR=4,5,0
Note: Start the GSM bearer as a client
OK
AT+WIPBR=3,5,15
Note: Read the local IP for GSM bearer
+WIPBR: 5,15,"1.1.1.1"
OK
AT+WIPBR=3,5,16
Note: Read the destination IP for GSM bearer
+WIPBR: 5,16,"2.2.2.2"
OK
AT+WIPBR=5,5
Note: Stop the GSM bearer
OK
AT+WIPBR=0,5
Note: Close the GSM bearer
OK

Chapter 2 – General Configuration AT Commands
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Bearers Handling +WIPBR Continued
Notes:
Starting a Bearer
The mandatory parameters to start a bearer in
•server mode: <cmdtype>, <bid>, <mode>, <login> and <password>
•client mode: <cmdtype>, <bid> and <mode>
Depending on the mode and the bearer type, additional parameters are required or forbidden:
Bid Mode Other Parameters
1,3,11,14,21,24 0 None
1,3,11,14,21,24 1 <PPP login>, <PPP password>
5 0 None
5 1 <login>,<password>[,<caller identity>]
6 0 None
Starting bearer as a server requires additional parameters as mentioned in the above table.
•For PPP server, only parameters <login> and <password> are required. They will be
compared with remote PPP client login and password.
•For GSM server, <login> and <password> will be used for PPP over GSM establishment
(same behavior as described for PPP server).
The <caller identity> is an optional ASCII string (type ASCII*). If not specified, then target will accept
all DATA calls (independently of caller identification). If specified, then target will only accept calls
from <caller identity> (which is the GSM data call number of the GSM client.
Opening bearer only consists in associating the IP protocol stack with the specified bearer. The
corresponding bearer setup has to be done through the adequate already existing AT commands
(please refer to +WMFM commands for UART1 and UART2, +CMUX command for CMUX virtual
ports and GSM/GPRS AT commands).
Several bearers can be opened at the same time but only one bearer can be started at a time.
If both DNS1 and DNS2 are displayed as “0.0.0.0” in the unsolicited message when bearer is opened
in server mode, it means that connecting to a remote IP host through an URL will fail.
The options WIP_BOPT_DIAL_REDIALCOUNT and WIP_BOPT_DIAL_REDIALDELAY will not be
implemented through AT commands. Nevertheless, for future compatibility reason, Opt num 3 and 4
are kept as reserved.
For GSM bearer, the options WIP_BOPT_IP_ADDR and WIP_BOPT_IP_DST_ADDR will display
valid addresses only when the bearer is started and connected; otherwise, it will display an address
"0.0.0.0".

Chapter 3 – IP Protocol Services
Multi-Tech Systems, Inc. IP Connectivity AT Commands for GPRS-F4 Wireless Modems (PN S000437E) 18
Chapter 3 – IP Protocol Services
Service Creation +WIPCREATE
Description: The +WIPCREATE command is used to create UDP, TCP client and TCP server
sockets associated with the specified index and FTP/HTTP/SMTP/POP3 service.
Only one FTP/HTTP/SMTP/POP3 session at a time is available.
If a local port is specified while creating a socket, the created socket will be
assigned to this port; if not, a port will be assigned dynamically by WIP application.
If peer IP and peer port is specified, the created socket will be connected to the
specified IP and port.
TCP server cannot be used to transfer data. To transfer data, it creates a local TCP
client socket. This process of creating local socket is referred as “spawning”. When
a server socket is created using, socket passively listens on a specified port for
incoming connections. The below mentioned diagram shows different states
managed for TCP server.
On reception of a connection request from a remote client socket, a server socket
does the following:
•Spawns a new socket (client) to connect to the remote socket
•Data transfer is done between the spawned socket and the remote socket
•Server socket remains in the listening mode and is ready to accept the
request from other clients
Description Notes:
•A SIM card must be inserted in order to use this command.
•The PIN 1/CHV 1 code must be entered to use this command.
•The PIN 2/CHV 2 does not have to be entered to use this command.
•The +WIND general indication command value from which +WIPCREATE
is allowed is 4. This value (4) indicates that the product is ready to process
AT commands (except phonebooks, AOC, SMS), but is still in emergency
mode. See Appendix A – GSM/GPRS +WIND AT Command.
Closed
Listen
Server Socket
Create Close Server
Socket channel
Server listening to the
remote socket for connect
request

Chapter 3 – IP Protocol Services
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Service Creation +WIPCREATE Continued
This diagram shows how to establish a connection.
Command Syntax: For a definition of <mode>, see Parameter/Defined Values on the next page.
If <mode>=1:
AT+WIPCREATE=<mode>,<communication index>,[<local port>] [,<peer IP>,<peer port>]
Response OK
If <mode>=2
AT+WIPCREATE=<mode>,<communication index>,<peer IP>,<peer port>
Response OK
If <mode>=3
AT+WIPCREATE=<mode>,<server index>,<local port>,<from idx>,<to idx>
Response OK
If <mode>=4
AT+WIPCREATE=<mode>,<index>,<server>[,<peer_port>],<username>, <password>
[,<account>]
Response OK
If <mode>=5
AT+WIPCREATE=<mode>,<index>,[<server>[,<peer port>]][,<username>,<password>]
[,<header list>[...]]]
Response OK
If <mode>=6 or 7
AT+WIPCREATE=<mode>,<index>,<server>[,<peer port>][,<username>,<password>]
Response OK
Read Command: AT+WIPCREATE? Displays current values.
Response OK
Test Command: AT+WIPCREATE=? Displays available values.
Response OK
Unsolicited Response: If <mode>=1 or 2
+WIPREADY: <mode>,<communication index>
If <mode>=3
+WIPACCEPT: <server index>,<communication idx>
If <mode>=5, 6 or 7
+WIPREADY: <mode>,<index>
Server Socket Client Socket
Client Socket
Spawned
Connect request
Spawn a new
socket
Connected
Transfer data
Socket
Closed

Chapter 3 – IP Protocol Services
Multi-Tech Systems, Inc. IP Connectivity AT Commands for GPRS-F4 Wireless Modems (PN S000437E) 20
Service Creation +WIPCREATE Continued
Parameters/Defined Values:
<mode>: Specifies Type of Socket
1 UDP
2 TCP Client
3 TCP Server
4 FTP
5 HTTP Client
6 SMTP Client
7 POP3 Client
<index>: TCP/UDP/FTP/HTTP/SMTP/POP3 Session Identifier
<local port>: Local TCP/UDP Port
<peer IP>: Peer IP Address; a string between quotes indicating an address either
in numeric form (e.g. “85.12.133.10”) or as a DNS entry (e.g.
“www.wavecom.com”)
<peer port>: Peer Port or the Server Port
For TTCP/UDP, this parameter is the port of the peer socket
For FTP,HTTP,SMTP and POP3, this parameter is the server port
Range: 1-65535 (Default Value for FTP: 21)
(Default Value for HTTP: 80)
(Default Value for SMTP: 25)
(Default Value for POP3: 110)
<from idx>: Minimum Index for Spawned TCP Sockets
Range: 1-8
<server index>: TCP Server Socket Identifier
Range: 1-4
<to idx>: Maximum Index for Spawned TCP Sockets
Range: 1-8
<communication index>: Indexes Reserved for Spawned Sockets
It cannot be used by other sockets even if the spawned sockets are not
created yet.
Range: 1-8
<server>: Server Address or Proxy Address
This parameter is the server address for FTP, SMTP and POP3 protocol
and for HTTP it is proxy server address.
It can either be a 32 bit number in dotted-decimal notation
(“xxx.xxx.xxx.xxx”) or an alpha numeric string format for hostname.
<user name>: Username for the Authentication in String Format
Authentication is disabled when this parameter is not specified for HTTP,
SMTP and POP3.
<password>: Password for the Authentication in String Format
Authentication is disabled when this parameter is not specified for HTTP,
SMTP and POP3.
<account>: Account Information of the User in String Format
This is required by some FTP server during authentication phases.
<header list>: HTTP Header Message (name-value pair)
The first string in the message header field is the name of the header
and the second string is the value of the header.
<…> Additional HTTP message header fields.
More pairs (name, value) of HTTP message header field can be added.
Parameter Storage: None