A7600 Series_SSL_Application Note

A7600 Series_ SSL_Application Note LTE Module SIMCom Wireless Solutions Limited Building B, SIM Technology Building, No.633, Jinzhong Road Changning District, Shanghai P.R. China Tel: 86-21-31575100 support@simcom.com www.simcom.com

A7600 Series_SSL_Application Note_V1.00 A7600 Series_SSL_Application Note 1.00 2020.6.19 Released Document Title: Version: Date: Status: GENERAL NOTES SIMCOM OFFERS THIS INFORMATION AS A SERVICE TO ITS CUSTOMERS, TO SUPPORT APPLICATION AND ENGINEERING EFFORTS THAT USE THE PRODUCTS DESIGNED BY SIMCOM. THE INFORMATION PROVIDED IS BASED UPON REQUIREMENTS SPECIFICALLY PROVIDED TO SIMCOM BY THE CUSTOMERS. SIMCOM HAS NOT UNDERTAKEN ANY INDEPENDENT SEARCH FOR ADDITIONAL RELEVANT INFORMATION, INCLUDING ANY INFORMATION THAT MAY BE IN THE CUSTOMER’S POSSESSION. FURTHERMORE, SYSTEM VALIDATION OF THIS PRODUCT DESIGNED BY SIMCOM WITHIN A LARGER ELECTRONIC SYSTEM REMAINS THE RESPONSIBILITY OF THE CUSTOMER OR THE CUSTOMER’S SYSTEM INTEGRATOR. ALL SPECIFICATIONS SUPPLIED HEREIN ARE SUBJECT TO CHANGE. COPYRIGHT THIS DOCUMENT CONTAINS PROPRIETARY TECHNICAL INFORMATION WHICH IS THE PROPERTY OF SIMCOM WIRELESS SOLUTIONS LIMITED COPYING, TO OTHERS AND USING THIS DOCUMENT, ARE FORBIDDEN WITHOUT EXPRESS AUTHORITY BY SIMCOM. OFFENDERS ARE LIABLE TO THE PAYMENT OF INDEMNIFICATIONS. ALL RIGHTS RESERVED BY SIMCOM IN THE PROPRIETARY TECHNICAL INFORMATION ，INCLUDING BUT NOT LIMITED TO REGISTRATION GRANTING OF A PATENT , A UTILITY MODEL OR DESIGN. ALL SPECIFICATION SUPPLIED HEREIN ARE SUBJECT TO CHANGE WITHOUT NOTICE AT ANY TIME. SIMCom Wireless Solutions Limited Building B, SIM Technology Building, No.633 Jinzhong Road, Changning District, Shanghai P.R. China Tel: +86 21 31575100 Email: simcom@simcom.com For more information, please visit: https://www.simcom.com/download/list-863-en.html For technical support, or to report documentation errors, please visit: https://www.simcom.com/ask/ or email to: support@simcom.com Copyright © 2020 SIMCom Wireless Solutions Limited All Rights Reserved. www.simcom.com 1 / 25

A7600 Series_SSL_Application Note_V1.00 About Document Version History Version V1.00 Date 2020.06.19 Chapter What is new New version Scope This document presents the AT Command Set for SIMCom A7600 Series, including A7600XX-XXXX, A5360E, and A7670X. www.simcom.com 2 / 25

A7600 Series_SSL_Application Note_V1.00 Contents About Document .................................................................................................................... 2 Version History ...................................................................................................................................... 2 Scope .................................................................................................................................................... 2 Contents ................................................................................................................................. 3 Introduction ...................................................................................................................... 4 1 1.1 Purpose of the document ................................................................................................................. 4 1.2 Related documents .......................................................................................................................... 4 1.3 Conventions and abbreviations ....................................................................................................... 4 1.4 The process of SSL AT Commands ................................................................................................. 5 1.5 Error Handling.................................................................................................................................. 6 1.5.1 Failed to Open SSL Connection ............................................................................................ 6 2 AT Commands for SSL .................................................................................................... 7 3 SSL Examples .................................................................................................................. 8 3.1 Access to TCP server ...................................................................................................................... 8 3.2 Access to SSL/TLS server (not verify server and client) ................................................................ 10 3.3 Access to SSL/TLS server (only verify the server) ......................................................................... 12 3.4 Access to SSL/TLS server (verify server and client) ...................................................................... 14 3.5 Access to SSL/TLS server (only verify the client) .......................................................................... 16 3.6 Access to SSL/TLS server in transparent mode ............................................................................ 18 3.7 Download certificate into module ................................................................................................... 20 4 Appendix ........................................................................................................................ 24 4.1 Result codes and unsolicited codes ............................................................................................... 24 4.1.1 Command result codes .............................................................................................. 24 4.1.2 Unsolicited result codes ....................................................................................................... 24 www.simcom.com 3 / 25

A7600 Series_SSL_Application Note_V1.00 1 Introduction 1.1 Purpose of the document Based on module AT command manual, this document will introduce SSL application process. Developers could understand and develop application quickly and efficiently based on this document. 1.2 Related documents [1] A7600 Series_AT Command Manual 1.3 Conventions and abbreviations PDP Packet Data Protocol; SSL Security Socket Layer; URC Unsolicited result codes; DNS Domain Name Server; www.simcom.com 4 / 25

A7600 Series_SSL_Application Note_V1.00 1.4 The process of SSL AT Commands SIM Card Status: Execute AT+CPIN?,if response is +CPIN:READY,means SIM Card Status is normal.Reboot the module or check SIM card status if AT+CPIN? Fails to identify SIM card in 20s. Signal quality: Execute AT+CSQ to query signal quality.If rssi is equals to 99,please check SIM card status or reboot the module CS Service: If of AT+CREG? equals to 1,it means that the module has registered on CS domain service.Reboot the module if it fails to registered on CS domain. PS Serivce: If of AT+CGREG?/AT+CEREG? equals to 1,it means that the module has registered on PS domain service. Power on the module Check the status of SIM card or Reboot the module Query SIM card status by AT+CPIN? +CPIN: READY Query signal quality by AT+CSQ +CSQ: ,,0 < rssi < 31 Query CS service by AT+CREG? +CREG: 0,1 Query PS service by AT+CGREG?/AT+CEREG? UE system information: If is “NO SERVICE”,it means network status has some problem. Query UE information by AT+CPSI? NO SERVICE 1.Configure PDP Context by AT+CGDCONT=,, 2.Activate the PDP Context by AT+CGACT=,[] 3.Query IP address of the PDP context by PDP Context: AT+CGACT? Configure the PDP context by AT+CGDCONT Active the PDP context by AT+CGACT=,[] and AT+CGACT? PDP ACTIVE FAIL Download certificate into module Download certificate into the module by AT+CCERTDOWN=, Configure the certificate Configure the SSL Context by AT+CSSLCFG Manage and list the certificate List certificates by AT+CCERTLIST Delete certificates by AT+CCERTDELE If use SSL,configure the SSL context before the other operation Configure the report mode of sending and receiving data by AT+CCHSET Before CCH set the report mode Configure the mode of sending and receiving data by AT+CCHMODE Before CCH set the transparent mode If AT+CCHMODE =1 will ignore the AT+CCHSET Y AT+CCHMODE=1? N Before the operation of CCH should excute AT+CCHSTART Start SSL service and active PDP context by AT+CCHSTART Set the SSL context by AT+CCHSSLCFG connect the server by AT+CCHOPEN=, ””,[,[]] Send data directly after showed below words CONNECT 115200 Get the IPv4 address after calling AT+CCHSTART by AT+CCHADDR Start SSL service and active PDP context by AT+CCHSTART Set the SSL context by AT+CCHSSLCFG connect the server by AT+CCHOPEN=, ””,[,[]] Quit transparent mode by +++ Enter transparent mode by ATO Disconnect from server by AT+CCHCLOSE= Stop SSL service by AT+CCHSTOP NO Report the recv data directly Send data by AT+CCHSEND=, AT+CCHSET=1,1? or AT+CCHSET=0,1? Disconnect from server by AT+CCHCLOSE= Judge the report mode is on or not YES Read the cached data that received from the server by AT+CCHRECV= [,] After operation of CCH ,close the session Stop SSL service by AT+CCHSTOP Stop the SSL service and deactive PDP www.simcom.com 5 / 25

A7600 Series_SSL_Application Note_V1.00 1.5 Error Handling 1.5.1 Failed to Open SSL Connection If it is failed to open SSL connection, please check the following aspects: 1. Query the status of the specified PDP context by AT+CGACT? command to check whether the specified PDP context has been activated. 2. Please check the SSL configuration by AT+CSSLCFG? command, especially the SSL version and cipher suite 3.When the CCHXXX: is not 0, it indicates an error code replied from CCH server. For more details, please refer to A7600 Series_AT Command Manual _V1.01.09. www.simcom.com 6 / 25

A7600 Series_SSL_Application Note_V1.00 2 AT Commands for SSL Command AT+CSSLCFG AT+CCERTDOWN AT+CCERTLIST AT+CCERTDELE AT+CCHSET AT+CCHMODE AT+CCHSTART AT+CCHSTOP AT+CCHADDR AT+CCHSSLCFG AT+CCHCFG AT+CCHOPEN AT+CCHCLOSE AT+CCHSEND AT+CCHRECV For more detailed information, please refer to A7600 Series_AT Command Manual. Description Configure the SSL Context Download certificate into the module List certificates Delete certificates Configure the report mode of sending and receiving data Configure the mode of sending and receiving data Start SSL service Stop SSL service Get the IPv4 address Set the SSL context Configure the Client Context Connect to server Disconnect from server Send data to server Read the cached data that received from the server www.simcom.com 7 / 25

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