Courier M2M 3G Cellular Modem USR3500 Application Guide R24.0794.00 Revision History Date Reason For Changes Version 1/28/14 Initial Release 1.0 2/25/14 Cosmetic updates 1.1 Copyright © 2014 USRobotics. All rights reserved. Trademarks USRobotics®, CourierTM and the USRobotics logo are registered trademarks of U.S. Robotics Corporation. Contact Information http://www.usr.com/contact Web: Consult our website for up-to-date product descriptions, documentation, application notes, firmware upgrades, and troubleshooting tips: http://www.usr.com/support/3500 ii 1 OVERVIEW ............................................................................................................................................................ 13 1.1 DEFINITIONS ..................................................................................................................................................... 13 1.2 DESIGN PRINCIPLES .......................................................................................................................................... 13 2 NETWORK CONFIGURATIONS ........................................................................................................................... 14 2.1 PRIVATE IP WITH VPN ....................................................................................................................................... 14 2.2 PRIVATE IP ....................................................................................................................................................... 15 2.2.1 Mobile Originated .................................................................................................................................... 15 2.2.2 Mobile Originated with SMS wake up (Server initiated) ......................................................................... 15 2.3 PUBLIC IP BASED ............................................................................................................................................... 16 2.4 STATIC VS DYNAMIC IP ADDRESSES .................................................................................................................... 17 2.5 CONNECTION METHODOLOGY ............................................................................................................................. 18 2.6 DATA CONNECTION ........................................................................................................................................... 18 3 NVM QUEUE .......................................................................................................................................................... 19 4 PROTOCOL OVERVIEW ....................................................................................................................................... 19 4.1 PROTOCOL ....................................................................................................................................................... 19 4.2 ASCII FORMAT ................................................................................................................................................. 19 4.3 ASCII COMMAND/RESPONSE TYPES ................................................................................................................... 21 5 STRING TOKENS .................................................................................................................................................. 24 5.1 STRINGSEND EVENTS .................................................................................................................................... 26 5.2 AT$STRINGTOKENS ..................................................................................................................................... 27 5.2.1 Action Command .................................................................................................................................... 27 5.2.2 Read Command ...................................................................................................................................... 27 5.3 AT$STRINGTEST .......................................................................................................................................... 27 5.3.1 Action Command .................................................................................................................................... 28 5.3.2 Example .................................................................................................................................................. 28 5.4 AT$STRINGSENDEMAIL ............................................................................................................................... 28 5.4.1 Action Command .................................................................................................................................... 28 5.4.2 Read Command ...................................................................................................................................... 29 5.4.3 Example .................................................................................................................................................. 30 5.5 AT$STRINGSENDSMS .................................................................................................................................. 31 5.5.1 Action Command .................................................................................................................................... 31 5.5.2 Read Command ...................................................................................................................................... 32 5.5.3 Example .................................................................................................................................................. 33 5.6 AT$STRINGSEND .......................................................................................................................................... 33 5.6.1 Action Command .................................................................................................................................... 33 5.6.2 Read Command ...................................................................................................................................... 34 5.6.3 Example 1: Send Email ......................................................................................................................... 35 5.6.4 Example 2: Serial to TCP Endpoint Connection .................................................................................... 35 6 SYSTEM VARIABLES ........................................................................................................................................... 37 6.1 VARIABLE IDENTIFIERS ....................................................................................................................................... 37 6.2 STRING TOKENS ................................................................................................................................................ 37 6.3 EVENTS ............................................................................................................................................................ 37 6.4 LIST OF STATUS VARIABLES ............................................................................................................................... 38 6.5 AT$VARIABLESTATUS ................................................................................................................................. 39 6.5.1 Read Command ...................................................................................................................................... 39 6.6 AT$VARIABLETHRESHOLD ......................................................................................................................... 40 6.6.1 Set Command ......................................................................................................................................... 40 6.6.2 Delete Command .................................................................................................................................... 40 6.6.3 Read Command ...................................................................................................................................... 40 6.6.4 Example .................................................................................................................................................. 41 6.7 AT$VARIABLECOMPARE ............................................................................................................................. 41 6.7.1 Set Command ......................................................................................................................................... 42 6.7.2 Delete Command .................................................................................................................................... 42 iii 6.7.3 Read Command ...................................................................................................................................... 42 6.7.4 Example .................................................................................................................................................. 43 6.8 AT$VARIABLESET ........................................................................................................................................ 43 6.8.1 Set Command ........................................................................................................................................