.. _SM_AT_commands:

|SM| AT commands
################

The application sample uses a series of proprietary AT commands to let the nRF91 development kit operate as a |SM| (SM).

The AT Commands have standardized syntax rules.

Words enclosed in <angle brackets> are references to syntactical elements.
Words enclosed in [square brackets] represent optional items that can be left out of the command line at the specified point.
The brackets are not used when the words appear in the command line.

``<CR>``, ``<LF>`` and ``<CR><LF>`` are allowed in an AT command sent by an application.

A string type parameter input must be enclosed between quotation marks (``"string"``).

There are 3 types of AT commands:

* Set command ``<CMD>[=...]``.
  Set commands set values or perform actions.
* Read command ``<CMD>?``.
  Read commands check the current values of subparameters.
* Test command ``<CMD>=?``.
  Test commands test the existence of the command and provide information about the type of its subparameters.
  Some test commands can also have other functionality.

AT responds to all commands with a final response.

See the following subpages for documentation of the proprietary AT commands.
The modem specific AT commands are documented in the `nRF91x1 AT Commands Reference Guide`_.

.. toctree::
   :maxdepth: 2
   :caption: Subpages:

   at_generic
   at_cmux
   at_coap
   at_dfu
   at_fota
   at_gnss
   at_httpc
   at_icmp
   at_carrier
   at_mqtt
   at_nrfcloud
   at_ppp
   at_provisioning
   at_sms
   at_socket
   at_trace