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Simcom Modules with Super SIM

Super SIM does not support NB-IoT.

Initialization

Only configure the modem’s Radio Access Technology (RAT) preference for Cat-M1 when you are connecting to LTE. To do so, issue AT+CMNB=1.

If you wish to limit comms to LTE only, i.e., no GSM, send AT+CNMP=38.

A parameter of 13 instead of 38 indicates GSM only. The default is 2, which is auto.

Bring up a data connection

  1. Set the APN: AT+CSTT="super","","".
  2. Bring up the wireless data connection: AT+CIICR.
  3. Obtain an IP address (required before TCP/IP operations): AT+CIFSR.
    • This will return the IP address.
  4. Optionally, query the current connection status: AT+CIPSTATUS.

To shut down the connection when you are done, issue AT+CIPSHUT.

Perform a ping

To perform a ping to a remote host after bringing up a connection as described above, issue AT+CIPPING="8.8.8.8". This will yield:

+CIPPING: 1,"8.8.8.8",111,53
+CIPPING: 2,"8.8.8.8",165,53
+CIPPING: 3,"8.8.8.8",159,53
+CIPPING: 4,"8.8.8.8",154,53
OK

Perform an HTTP GET

To perform an HTTP GET using the built-in HTTP client:

  1. Configure the bearer: AT+SAPBR=3,1,"APN","super".
  2. Check the bearer’s status: AT+SAPBR=2,1.
    • This will return +SAPBR: 1,3,"0.0.0.0". The 3 indicates the connection is closed.
  3. Connect: AT+SAPBR=1,1.
  4. Initialize the HTTP service: AT+HTTPINIT.
  5. Set the URL: AT+HTTPPARA="URL","http://ifconfig.co/ip".
  6. Initiate this as a GET operation: AT+HTTPACTION=0.

After the OK response to the last of these commands, some time will pass and then the result will be indicated by a +HTTPACTION URC:

+HTTPACTION: 0,200,13

This indicates that we received an HTTP response status of 200 and 13 response bytes. Let’s read them starting at index 0. Use AT+HTTPREAD=0,13. The response will be something like:

+HTTPREAD: 13
3.23.456.789

OK

To terminate the HTTP service, issue AT+HTTPTERM.

Finally, disconnect the bearer with AT+SAPBR=0,1.

This uses a service that returns the IP address of the requester.

Low-power modes

The SIM7000 supports the eDRX and PSM low-power modes. The commands to enable each of these are:

  • eDRX: AT+CEDRXS
  • PSM: AT+CPSMS

Using these features, but especially PSM, can make the modem inaccessible to the terminal during its sleep time. It’s best to experiment with these features with the modem local. To disable all power saving, send:

AT+CEDRXS=0
AT+CPSMS=0

You can learn more about implementing these modes in our low-power usage documentation.

Known issues

None at this time.

Super SIM does not support NB-IoT.

Initialization

If you wish to limit comms to LTE only, i.e., no GSM, send AT+CNMP=38.

A parameter of 13 instead of 38 indicates GSM only. The default is 2, which is auto.

Set the modem’s Radio Access Technology (RAT) preference to Cat-M1 when you are connecting to LTE. To do so, issue AT+CMNB=1.

After power on, the modem takes approximately 26 seconds to bring up the UART for AT communications.

Bring up a data connection

  1. Activate a data connection: AT+CNACT=0,1.
    • The 0 parameter is the PDP context; four (0-3) are available.
  2. A successful response includes the string ACTIVE.
  3. Optionally, obtain an IP address and the current connection status with AT+CNACT?.
  4. To shut down the connection when you are done, issue AT+CNACT=0,0.

Perform a ping

To perform a ping to a remote host after bringing up a connection as described above, issue AT+SNPDPID=0 to choose the connected PDP context and then AT+SNPING4="8.8.8.8".

Perform an HTTP GET

To perform an HTTP GET using the built-in HTTP client:

  1. Activate the data connection as above.
  2. Configure a session to the server with AT+SHCONF="URL","example.com".
  3. Connect to the server with AT+SHCONN.
  4. Optionally, check the connection state with AT+SHSTATE?.
  5. To add headers to the request, set the module’s internal header record. Issue AT+SHCONF="HEADERLEN",350 to set the internal header record’s maximum size. Call AT+SHCHEAD to clear any existing header and the add header entries with AT+SHAHEAD:
    AT+SHAHEAD="Content-Type","application/x-www-form-urlencoded"
    AT+SHAHEAD="Cache-control","no-cache"
    AT+SHAHEAD="Connection","keep-alive"
  6. The same approach is taken for the request URL parameters, if there is one. Issue AT+SHCONF="BODYLEN",1024 to set the internal body record’s maximum size. Call AT+SHCPARA to clear the internal parameter record and then AT+SHPARA="data","<your_request_parameters>" to set the new parameter data.
  7. Issue the request with AT+SHREQ="<path_to_resource>",1.
    • The 1 parameter indicates a GET request. Others are:
      • 2 (PUT)
      • 3 (POST)
      • 4 (PATCH)
      • 5 (HEAD)
  8. The URC will contain SHREQ: "GET",xxx,yyy where xxx is the HTTP status code and yyy the number of bytes received. For example:
    SHREQ: "GET",200,83
  9. Issue AT+SHREAD=0,yyy to get yyy bytes from index 0 sent over. For example:
    AT+SHREAD=0,83
    OK
     
    +SHREAD: 83
    {
      "userId": 1,
      "id": 1,
      "title": "delectus aut autem",
      "completed": false
    }
  10. Call AT+SHDISC to disconnect from the server.
  11. Optionally, close the data connection

The steps above assume you are sending an HTTP request. To use HTTPS, you will need to apply additional settings. For testing only, we use:

AT+CSSLCFG="sslversion",1,3
AT+SHSSL=1,"<cert_name>"

This selects SSL configuration index 1, and then SSL version 1.2. The next line applies a certificate name to SSL configuration index 1, but you can pass an empty string to bypass certificate verification for testing only.

A full discussion of HTTPS configuration on this module is beynd the scope of this document. For more information, please see Simcom’s HTTPS Application Note.

Low-power modes

The SIM7080 supports the eDRX and PSM low-power modes. The commands to enable each of these are:

  • eDRX: AT+CEDRXS
  • PSM: AT+CPSMS

Using these features, but especially PSM, can make the modem inaccessible to the terminal during its sleep time. It’s best to experiment with these features with the modem local. To disable all power saving, send:

AT+CEDRXS=0
AT+CPSMS=0

You can learn more about implementing these modes in our low-power usage documentation.

Known issues

None at this time.

SIM7600A Cat 4

Initialization

To configure the APN, use AT+CGDCONT=1,"IP","super".

Perform a ping

To perform a ping to a remote host after bringing up a connection as described above, issue AT+CPING="8.8.8.8",1. This will yield:

OK
+CPING: 1,8.8.8.8,64,70,255
+CPING: 3,1,1,0,70,70,70

Perform an HTTP GET

To perform an HTTP GET using the built-in HTTP client:

  1. Set IP mode: AT+CIPMODE=1.
  2. Connect a socket: AT+NETOPEN.
  3. Initialize the HTTP service: AT+HTTPINIT.
  4. Check an IP address has been assigned: AT+CGPADDR.
    • This will return something like: +CGPADDR: 1,100.66.159.130.
  5. Set the URL : AT+HTTPPARA="URL","http://ifconfig.co/ip".
  6. Initiate this as a GET operation: AT+HTTPACTION=0.

After the OK response, some time will pass and then the result will be indicated by a +HTTPACTION URC:

+HTTPACTION: 0,200,13

This indicates that we received an HTTP response status of 200 and 13 response bytes. Let’s read them starting at index 0. Issue AT+HTTPREAD=0,12. This will yield:

+HTTPREAD: 13
3.84.68.183

OK

To terminate the HTTP service, issue AT+HTTPTERM.

Now close the socket with AT+NETCLOSE.

This uses a service that returns the IP address of the requester.

Known issues

None at this time.

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