SimCom SIM7600 Series Command Manual
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SimCom SIM7600 Series Command Manual

Lte module
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SIM7500_SIM7600_SIM7800 Series_SSL_AT
Command Manual_V1.00
LTE Module
Shanghai SIMCom Wireless Solutions Ltd.
Building A, SIM Technology Building, No.633, Jinzhong Road
Changning District 200335
Tel:86-21-31575100/31575200
support@simcom.com
www.simcom.com

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  • Page 1 SIM7500_SIM7600_SIM7800 Series_SSL_AT Command Manual_V1.00 LTE Module Shanghai SIMCom Wireless Solutions Ltd. Building A, SIM Technology Building, No.633, Jinzhong Road Changning District 200335 Tel:86-21-31575100/31575200 support@simcom.com www.simcom.com...
  • Page 2 Manual_V1.00 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.

  • Page 3: Version History

    Smart Machine Smart Decision Version History Version Date Chapter What is new V1.00 2018-09-28 New version SIM7500_SIM7600_SIM7800 Series_SSL_AT Command Manual 2 / 36...

  • Page 4: Table Of Contents

    Smart Machine Smart Decision Contents Version History ..............................2 Contents ................................3 Introduction .............................. 4 1.1 The SSL Context Management AT Commands ................... 4 1.2 The process of Using SSL AT Commands ....................4 2 Description of AT Command ........................5 2.1 SSL Context Management AT ........................

  • Page 5: Introduction

    Smart Machine Smart Decision 1 Introduction 1.1 The SSL Context Management AT Commands Step 1: Configure SSL version by AT+CSSLCFG=“sslversion”,<ssl_ctx_index>,<sslversion>. Step 2: Configure SSL authentication mode by AT+CSSLCFG=“authmode”,<ssl_ctx_index>, <authmode>. Step 3: Configure the flag of ignore local time by AT+CSSLCFG=“ignorlocaltime”,<ssl_ctx_index>,<ignoreltime>. Step 4: Configure the max time in SSL negotiation stage by AT+CSSLCFG=“negotiatetime”,<ssl_ctx_index>,<negotiatetime>.

  • Page 6: Description Of At Command

    Smart Machine Smart Decision 2 Description of AT Command 2.1 SSL Context Management AT 2.1.1 AT+CSSLCFG Configure the SSL Context AT+CSSLCFG Configure the SSL Context Response +CSSLCFG: "sslversion",(0-9),(0-4) +CSSLCFG: "authmode",(0-9),(0-3) +CSSLCFG: "ignorelocaltime",(0-9),(0,1) Test Command +CSSLCFG: "negotiatetime",(0-9),(10-300) AT+CSSLCFG=? +CSSLCFG: "cacert",(0-9),(5-128) +CSSLCFG: "clientcert",(0-9),(5-128) +CSSLCFG: "clientkey",(0-9),(5-128) Response +CSSLCFG:...
  • Page 7 Smart Machine Smart Decision +CSSLCFG: 6,<sslversion>,<authmode>,<ignoreltime>,<negotiatetime>,< ca_file>,<clientcert_file>,<clientkey_file> +CSSLCFG: 7,<sslversion>,<authmode>,<ignoreltime>,<negotiatetime>,< ca_file>,<clientcert_file>,<clientkey_file> +CSSLCFG: 8,<sslversion>,<authmode>,<ignoreltime>,<negotiatetime>,< ca_file>,<clientcert_file>,<clientkey_file> +CSSLCFG: 9,<sslversion>,<authmode>,<ignoreltime>,<negotiatetime>,< ca_file>,<clientcert_file>,<clientkey_file> Response Write Command +CSSLCFG: Query the configuration of the specified <ssl_ctxindex>,<sslversion>,<authmode>,<ignoreltime>,<ne SSL context gotiatetime>,<ca_file>,<clientcert_file>,<clientkey_file> AT+CSSLCFG=<ssl_ctx_index> Write Command Response a)If successfully: Configure the version of the specified SSL context AT+CSSLCFG="sslversion",<ssl_ctx_in b)If failed:...
  • Page 8 Smart Machine Smart Decision _index>,<negotiatetime> ERROR Write Command Response a)If successfully: Configure the server root CA of the specified SSL context AT+CSSLCFG="cacert",<ssl_ctx_index> b)If failed: ,<ca_file> ERROR Write Command Response a)If successfully: Configure the client certificate of the specified SSL context AT+CSSLCFG="clientcert",<ssl_ctx_ind b)If failed: ex>,<clientcert_file>...
  • Page 9 Smart Machine Smart Decision <negotiatetime> The timeout value used in SSL negotiate stage. The range is 10-300 seconds. The default value is 300. <ca_file> The root CA file name of SSL context. The file name must have type like “.pem” or “.der”.The length of filename is from 5 to 128 bytes.

  • Page 10: At+Ccertdown Download Certificate Into The Module

    Smart Machine Smart Decision Command Manual 2.1.2 AT+CCERTDOWN Download certificate into the module AT+CCERTDOWN Download certificate into the module Response Test Command +CCERTDOWN: (5-128),(1-10240) AT+CCERTDOWN=? Response a)If it can be download: > Write Command AT+CCERTDOWN=<filename>,<len> <input data here> b)If failed: ERROR Defined Values <filename>...

  • Page 11: At+Ccertdele Delete Certificates

    Smart Machine Smart Decision <CR><LF>] Defined Values <filename> The certificate/key files which has been downloaded to the module. If the filename contains non-ASCII characters, it will show the non-ASCII characters as UTF8 code. 2.1.4 AT+CCERTDELE Delete certificates AT+CCERTDELE Delete certificate from the module Response a)If delete successfully: Write Command...

  • Page 12: At+Cchmode Configure The Mode Of Sending And Receiving Data

    Smart Machine Smart Decision AT+CCHSET Configure the report mode of sending and receiving Response Test Command +CCHSET: (0,1),(0,1) AT+CCHSET=? Response Read Command +CCHSET: <report_send_result>,<recv_mode> AT+CCHSET? Response Write Command a)If successfully: AT+CCHSET=<report_send_result>[,<re b)If failed: cv_mode>] ERROR Defined Values <report_send_result> Whether to report result of CCHSEND, the default value is 0: 0 –...

  • Page 13: At+Cchstart Start Ssl Service

    Smart Machine Smart Decision Response a)If successfully: Write Command AT+CCHMODE=<mode> b)If failed: ERROR Defined Values <mode> The mode value: 0 – Normal. 1 – Transparent mode The default value is 0. 2.2.3 AT+CCHSTART Start SSL service AT+CCHSTART is used to start SSL service by activating PDP context. You must execute AT+CCHSTART before any other SSL related operations.

  • Page 14: At+Cchstop Stop Ssl Service

    Smart Machine Smart Decision 2.2.4 AT+CCHSTOP Stop SSL service AT+CCHSTOP is used to stop SSL service. AT+CCHSTOP STOP SSL service Response a)If stop SSL service successfully: +CCHSTOP: 0 Execute Command b)If stop SSL service successfully: AT+CCHSTOP +CCHSTOP: 0 c)If failed: ERROR Defined Values <err>...

  • Page 15: At+Cchopen Connect To Server

    Smart Machine Smart Decision NOTE: If you don’t set the SSL context by this command before connecting to SSL/TLS server by AT+CCHOPEN, the CCHOPEN operation will use the SSL context as same as index <session_id> (the 1st parameter of AT+CCHOPEN) when connecting to the server. AT+CCHSSLCFG Set the SSL context Response + CCHSSLCFG: (0,1),(0-9)

  • Page 16: At+Cchclose Disconnect From Server

    Smart Machine Smart Decision b)If connect successfully： +CCHOPEN: <session_id>,0 c)If connect successfully in transparent mode： CONNECT [<text>] d)If failed： +CCHOPEN: <session_id>,<err> e)If failed: ERROR f)If failed in transparent mode: CONNECT FAIL Defined Values <session_id> The session index to operate. It’s from 0 to 1. <host>...

  • Page 17: At+Cchsend Send Data To Server

    Smart Machine Smart Decision b)If successfully： +CCHCLOSE: <session_id>,0 c)If successfully in transparent mode： CLOSED d)If failed: ERROR Defined Values <session_id> The session index to operate. It’s from 0 to 1. The result code: 0 is success. Other values are failure. Please <err>...

  • Page 18: At+Cchrecv Read The Cached Data That Received From The Server

    Smart Machine Smart Decision blocked. b)If parameter is wrong or other errors occur: ERROR Defined Values <session_id> The session_id to operate. It’s from 0 to 1. <len> The length of data to send. Its range is from 1 to 2048 bytes. <unsent_len_0>...

  • Page 19: Command Result Codes And Unsolicited Codes

    Smart Machine Smart Decision calling. It will read all the received data when the value is greater than the length of RX data cached for session <session_id>. 0 means the maximum bytes to receive is 2048 bytes. (But, when 2048 is greater than the length of RX data cached for session <session_id>, 0 means the length of RX data cached for session <session_id>).

  • Page 20: Unsolicited Result Codes

    Smart Machine Smart Decision Not set certificates 2.3.2 Unsolicited result codes Unsolicited codes +CCHEVENT: <session_id>,RECV In manual receiving mode, when new data of a connection EVENT arriving to the module, this unsolicited result code will be reported to MCU. +CCH_RECV_CLOSED: When receive data occurred any error, this unsolicited result <session_id>,<err>...

  • Page 21: Access To Tcp Server

    Smart Machine Smart Decision // Specify the parameter value of the PDP context corresponding to cid AT+CGSOCKCONT=1,"IP","CMNET" AT+CGPADDR +CGPADDR: 1,10.49.14.68 //ensure the first PDP context get a IP address +CGPADDR: 4,0.0.0.0 Note: usually CSOCKAUTH and CSOCKSETPN parameter are kept default if not care about. 3.1 Access to TCP server Following commands shows how to communicate with a TCP server.
  • Page 22 Smart Machine Smart Decision Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: zh-cn,zh;q=0.5 Accept-Encoding: gzip, deflate Accept-Charset: GB2312,utf-8;q=0.7,*;q=0.7 Keep-Alive: 115 Connection: keep-alive Cookie: BAIDUID=D6F6D0D297CCAE39BD45C683996696C7:FG=1; Hm_lvt_9f14aaa038bbba8b12ec2a4a3e51d254=1321597443439; USERID=e194072f4759c0f7c2b6e5d3b09298984fd1 +CCHSEND: 0,0 //report the received data from server +CCHRECV: DATA,0,757 HTTP/1.1 302 Found Connection: Keep-Alive Content-Length: 225 Content-Type: text/html Date: Wed, 05 Sep 2018 08:59:38 GMT Location: https://www.baidu.com/ Server: BWS/1.1...

  • Page 23: Access To Ssl/Tls Server (Not Verify Server And Client)

    Smart Machine Smart Decision AT+CCHSTOP +CCHSTOP: 0 3.2 Access to SSL/TLS server (not verify server and client) Following commands shows how to access to a SSL/TLS server without verifying the server. It needs to configure the authentication mode to 0, and then it will connect to the server successfully. // Set the SSL version of the first SSL context AT+CSSLCFG=”sslversion”,0,4 // Set the authentication mode(not verify server) of the first SSL context...
  • Page 24 Smart Machine Smart Decision Content-Length: 0 +CCHSEND: 0,0 //report the received data from server +CCHRECV: DATA,0,917 HTTP/1.1 200 OK Accept-Ranges: bytes Cache-Control: no-cache Connection: Keep-Alive Content-Length: 227 Content-Type: text/html Date: Tue, 04 Sep 2018 06:21:35 GMT Etag: "5b7b7f40-e3" Last-Modified: Tue, 21 Aug 2018 02:56:00 GMT P3p: CP="...

  • Page 25: Access To Ssl/Tls Server (Only Verify The Server)

    Smart Machine Smart Decision +CCHCLOSE: 0 //stop SSL Service AT+CCHSTOP +CCHSTOP: 0 3.3 Access to SSL/TLS server (only verify the server) Following commands shows how to access to a SSL/TLS server with verifying the server. It needs to configure the authentication mode to 1 and the right server root CA, and then it will connect to the server successfully. // Set the SSL version of the first SSL context AT+CSSLCFG=”sslversion”,0,4 // Set the authentication mode(verify server) of the first SSL context...
  • Page 26 Smart Machine Smart Decision +CCHOPEN: 0,0 //send data to server AT+CCHSEND=0,121 >GET / HTTP/1.1 Host: www.baidu.com User-Agent: MAUI htp User Agent Proxy-Connection: keep-alive Content-Length: 0 +CCHSEND: 0,0 //report the received data from server +CCHRECV: DATA,0,917 HTTP/1.1 200 OK Accept-Ranges: bytes Cache-Control: no-cache Connection: Keep-Alive Content-Length: 227...

  • Page 27: Access To Ssl/Tls Server (Verify Server And Client)

    Smart Machine Smart Decision </body> </html> //Disconnect from the Service AT+CCHCLOSE=0 +CCHCLOSE: 0 //stop SSL Service AT+CCHSTOP +CCHSTOP: 0 3.4 Access to SSL/TLS server (verify server and client) Following commands shows how to access to a SSL/TLS server with verifying the server and client. It needs to configure the authentication mode to 2, the right server root CA, the right client certificate and key, and then it will connect to the server successfully.
  • Page 28 Smart Machine Smart Decision // Enable reporting +CHSEND result AT+CCHSET=1 // start SSL service, activate PDP context AT+CCHSTART +CCHSTART: 0 // Set the first SSL context to be used in the SSL connection AT+CCHSSLCFG=0,0 //connect to SSL/TLS server AT+CCHOPEN=0, ”www.baidu.com”,443,2 +CCHOPEN: 0,0 //send data to server AT+CCHSEND=0,121...

  • Page 29: Access To Ssl/Tls Server (Only Verify The Client)

    Smart Machine Smart Decision Server: BWS/1.1 Set-Cookie: BD_NOT_HTTPS=1; path=/; Max-Age=300 Set-Cookie: BIDUPSID=D95046B2B3D5455BF01A622DB8DED9EA; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com Set-Cookie: PSTM=1536042095; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com Strict-Transport-Security: max-age=0 X-Ua-Compatible: IE=Edge,chrome=1 <html> <head> <script> location.replace(location.href.replace("https://","http://")); </script> </head> <body> <noscript><meta http-equiv="refresh" content="0;url=http://www.baidu.com/"></noscript> </body>...
  • Page 30 Smart Machine Smart Decision // Set the authentication mode(only verify client) of the first SSL context AT+CSSLCFG=”authmode”,0,3 // Set the client certificate of the first SSL context AT+CSSLCFG=”clientcert”,0,”cert.pem” // Set the client key of the first SSL context AT+CSSLCFG=”clientkey”,0,”key_cert.pem” // Enable reporting +CHSEND result AT+CCHSET=1 // start SSL service, activate PDP context...
  • Page 31 Smart Machine Smart Decision +CCHRECV: DATA,0,917 HTTP/1.1 200 OK Accept-Ranges: bytes Cache-Control: no-cache Connection: Keep-Alive Content-Length: 227 Content-Type: text/html Date: Tue, 04 Sep 2018 06:21:35 GMT Etag: "5b7b7f40-e3" Last-Modified: Tue, 21 Aug 2018 02:56:00 GMT P3p: CP=" OTI DSP COR IVA OUR IND COM " Pragma: no-cache Server: BWS/1.1 Set-Cookie: BD_NOT_HTTPS=1;...

  • Page 32: Access To Ssl/Tls Server In Transparent Mode

    Smart Machine Smart Decision 3.6 Access to SSL/TLS server in transparent mode Following commands shows how to access to a SSL/TLS server with not verifying the server in transparent mode. It needs to configure the sending and receiving mode to 1(the transparent mode). Only the session 0 is support the transparent mode.

  • Page 33: Download Certificate Into Module

    Smart Machine Smart Decision Last-Modified: Tue, 21 Aug 2018 02:56:00 GMT P3p: CP=" OTI DSP COR IVA OUR IND COM " Pragma: no-cache Server: BWS/1.1 Set-Cookie: BD_NOT_HTTPS=1; path=/; Max-Age=300 Set-Cookie: BIDUPSID=F19D0F1E532ED84CE275BC1006F91F9E; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com Set-Cookie: PSTM=1536042363; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com Strict-Transport-Security: max-age=0 X-Ua-Compatible: IE=Edge,chrome=1...
  • Page 34 Smart Machine Smart Decision // download file with ASCII coding file name AT+CCERTDOWN=”client_key.der”,1702 > -----BEGIN RSA PRIVATE KEY----- MIIEowIBAAKCAQEAlwuz/TNa+foGBG6rXpWE1Wnuc+GN9vS7MRenKOH+z2UfGuaV BSb8VYFCgoL4RnWLwXAcLlaqw88zlCN89EK6IydaAwNmI/U6nu3oPsVkn8r9+sOX yh9VD01DmSU349QWJvRgt1ocsFI1VTdd6RDkVtu7FdKv4XC5WHcOD7yrEIsVa7+G Qbnm5cCCz8E75HH8vHZAOFeaV3HvIHnh/1RZ+jh4ysyhEmFNOFCn3r9v2yu4kPRX 43xEsB13Ue4HgSbnT+Q7LlEK+dfsmUBoSpsS2NAmQOiqGrmmYygT3/V/lSX54hit gli5bvg9DuNHYBwh2C+4nyZF95pMj2dEJf4jNwIDAQABAoIBAAJ9ze06QKDo79p4 3NjFjJhck/NTYB0XslK/+iDhgWt4VogCD6kzGGxsomU2tdOrsq9xIvXcthpeu5IQ 98mrpBhaWNC96JxlOh9O+0q1xNAh8AiH22QZGjUTaC8Jfx+B6w+fbkz37os1/+00 6ZajkbChFTfp7r7ANj5wUEoQKZ4vNpLJxLWDk6uH4ZMNveWcBaZQ21TUg9ZmoskK EJ2ZEr/3kOSBgi2B6F50zyL8f1mbqPahHNLqtrndV5/Lr4n74TqZXRwt5Cl9GrBv tYXDHc+5Y7e1TUlXV00AMDIk+3cVR8m8Oa20tSdXjcw2iUk9brxb4uxreOouGfPW 5lO+q1ECgYEA4Kkok17DVx5FiapFQvJ2Jqi2/WhzDncuBGbZtcLZnwRVfkPn3cBZ JGNwxYyfEdwItPvTYQYh6Qg81XRdSRfF43GzkQXNmkPOdZM0x3tFwzV6K5Fg7aeR g50UddaA9MraCltOgK++7C6BvA3ImXciK4VWeSZOmDW99Y6mgf92RdkCgYEArB2u /Id72LGQBmx0Z+36Hf1dxo6RQ+dB+m6XBMR8iuB/jGO/5PHdFoKoF2qa9Yj2W1+X B29Xmc1HS6GTvkDIsN5JXNO7fDmlAxd5whbwDdcmv3VEt8xJ2UeACIawjKtVcFoH LRNlvDBttWVvlCZg+9HfVpuPm14oFxN/HtSXt48CgYACxDJ6thUDspy6mD0oGOI5 kaRHNI0OJYuMhFOz+EVDvwLqfh2RzneKiiruU8/1oVb+G4e7zx6FxxMwsbEgYEmQ hmrmo0Kn3qPhMMHanvr572Oku7KM2p5hF4MT/GM0IHdU31D1JrTcJap1TVomAaCL FqY88arQFwFSz8HfIe0r6QKBgCbQLtTdzKzqJdt8+6cwQFYg+9O59MJGVVefNskp chhzVfAX0n9Tl5Lq9fMJ5FX4g+3JGargjfWuGCTTFBk0TM2t4wde7AmwiiivU5LU T2Afo6pLTKrSE9k+yX2iug+O156VfsbIeAm/Ng5RCJ91JCvFgULro6/axNmnWORf 9rK7AoGBAIK4edrX1MjerCsLu3y9Dy4pAx6ER6ei4xpkO25U8wUcqqc+YD2m2xlA DjqROITeaxXkmPIyRKAXVarhk8LmXT/oDFUAPsTqUZ9LBrviqtMi+G2OFPbdKDwe ZBNAgwFpFlUVoi0UYnZF8rBq0tepqivrayEWdKKfMMJjq+l72SxD...
  • Page 35 Smart Machine Smart Decision -----END RSA PRIVATE KEY----- // download file with not ASCII coding file name AT+CCERTDOWN={non-ascii}"262378344532443B262378353334453B2E70656D",1918 >-----BEGIN CERTIFICATE----- MIIFRDCCAyygAwIBAgIIZmPau7FelQswDQYJKoZIhvcNAQELBQAwQDELMAkGA1UE BhMCU0kxGzAZBgNVBAoMEnN0YXRlLWluc3RpdHV0aW9uczEUMBIGA1UEAwwLVGF4 IENBIFRlc3QwHhcNMTUwNzIzMTUyOTA1WhcNMzUwNzIzMTUyOTA1WjBAMQswCQYD VQQGEwJTSTEbMBkGA1UECgwSc3RhdGUtaW5zdGl0dXRpb25zMRQwEgYDVQQDDAtU YXggQ0EgVGVzdDCCAiIwDQYJKoZIhvcNAQEBBQADggIPADCCAgoCggIBALmH3XNA KDgN8+G2jX4W/a7LTER10VbRhkGeuc9zyOuj9gigYXLno4Im/S4iXMcCs1IxgSsj NJ1YMOje4qgHbFKQwWV588VDw7/fiMMZIXvFjHfladdHASEDMT53bKX3HIdJZ/iL 6xhpJ/+C/I8dnWcMZUkeP+9BUAni/I2xrHaAVlli0aS6uc/DjO7b4Gj1Vl4FGIHo DlH+LmWz26P2gg2xnpWgIxXzs5sN8nYErwu+6h/9xREHco8PPCAZb5HZhqoIzYzk N1S1Do6qAzt/wJM0mhWOWHt9fhp/RoYQ5ZFClZmgd1cJcr6S6U7ebAQ+yYRsIWU5 +FLYZ4Zlt3ZAHNWyraMee/kFsaGcO21cwE+tPDOIn41B8XvfaXApQt4+TejZWzoH V0ojA+9H8V+wCFVMJssViFOzuS6SlEZ/xzslo+B//cfUkq/PnWLJHEy4BJXsj4+F CvliZ7Lq3B/RcQmBjmTRQ0mxahiMGrrQW4TLjUYgY8IfwKfMfwFwVwUyk5br9Grs UX7jy7+Xx17Qed4p0jjOC7KutzRIGr6ULSk11qpd5IHeIwzSOaTXk6rAzZYupPH5 KvY65mdRfq0C0cB2bMvk9m9lyeLfZz5+L9XDLlodTdwOeWaKvjFErT8WSEkpHxtG q13TVgicoxsHC2K+8hpFjpaz69ZCmTzj4/17AgMBAAGjQjBAMB0GA1UdDgQWBBQz zVr7CUfHAeY2KCb1gXy3jjX3sjAPBgNVHRMBAf8EBTADAQH/MA4GA1UdDwEB/wQE AwIBBjANBgkqhkiG9w0BAQsFAAOCAgEAR9xtbaNa/jSAAyqe3aq88GG7rCyxROGH BPcakfMmhx1cLYdcY5ATXL/n67eo+S+1g7e/sK3fVXav5qWs9oUEhAOgcOACMohu JlBbMq2Qp8lxdpiRWCcyiY1vGQcHcZ02oey/c06fBZE4iqJdYAhYhsBB5H+idtwJ s6Lade4wqG58hWCNKBxU+KWDckGGX5CxsfU7gdYgjyKq0ow60qQWi4H8pD+WO1Bn rvISkAT7vMk2BOz+YlCKZmuq0h3PCkK5T6xA01fUZCaeze0RozFaekDBEHK0bc1D My3SKbB3cjdcMzmV8sVdxnNOTxlrP7+BinctxT3q3Va96kTmwI5pD0x6KOwC7Urr...
  • Page 36 Smart Machine Smart Decision 53ubhI3U2XBAzkk14lDLU+7tqBqhDWwIMN0NyW1MRTF8JB9Rz+4yCcDWMOT/FZg7 C60RrcnaO/0GETDz6XI6zedBXo1Q/rJTtXMOr8iVnc+joZyO2ImOuTwP3C7M3Bnp gFHqDtD48n9PV9prhbD4fYPyMe/3rshtBcpGAy2cGjpsP28pkvP8lwBaP8pnpxvQ 7d3oiCBzznaOHjhm8+8C53b/1txzj/LP/4ZzIynsOhxy4cihEPhAg1MKUY9qnbw9 9Q6EKrCSqk3TPqiWrTtu4pxyiEiquCHk8n+HX5cVhxUkaEShdx4bjgvKB7JRF2T2 ST1lrKEM2DY= -----END CERTIFICATE----- //list certificate files AT+CCERTLIST +CCERTLIST: "&#x4E2D;&#x534E;.pem" +CCERTLIST: "client_key.der" SIM7500_SIM7600_SIM7800 Series_SSL_AT Command Manual 35 / 36...

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