docs: Backported some AT command docs to esp8266

Includes the following AT commands:
- AT+USERRAM
- AT+USEROTA
- AT+USERWKMCUCFG
- AT+USERMCUSLEEP
- AT+CIPSTATE
- AT+CWSTATE

Author: ustccw

docs/en/AT_Command_Set/Basic_AT_Commands.rst

@@ -17,7 +17,6 @@ Basic AT Commands
 -  :ref:`AT+SLEEP <cmd-SLEEP>`: Set the sleep mode.
 -  :ref:`AT+SYSRAM <cmd-SYSRAM>`: Query current remaining heap size and minimum heap size.
 -  :ref:`AT+SYSMSG <cmd-SYSMSG>`: Query/Set System Prompt Information.
--  :ref:`AT+USERRAM <cmd-USERRAM>`: Operate user's free RAM.
 -  :ref:`AT+SYSFLASH <cmd-SYSFLASH>`: Query/Set User Partitions in Flash.
 -  [ESP32 Only] :ref:`AT+FS <cmd-FS>`: Filesystem Operations.
 -  :ref:`AT+RFPOWER <cmd-RFPOWER>`: Query/Set RF TX Power.
@@ -625,89 +624,6 @@ Example
     // print no prompt info when the connection status is changed
     AT+SYSMSG=2
 
-.. _cmd-USERRAM:
-
-:ref:`AT+USERRAM <Basic-AT>`: Operate user's free RAM
-------------------------------------------------------
-
-Query Command
-^^^^^^^^^^^^^
-
-**Function:**
-
-Query the current available user's RAM size.
-
-**Command:**
-
-::
-
-    AT+USERRAM?
-
-**Response:**
-
-::
-
-    +USERRAM:<size>
-    OK
-
-Set Command
-^^^^^^^^^^^
-
-**Function:**
-
-Operate user's free RAM
-
-**Command:**
-
-::
-
-    AT+USERRAM=<operation>,<size>[,<offset>]
-
-**Response:**
-
-::
-    +USERRAM:<length>,<data>    // esp-at returns this response only when the operator is ``read``
-
-    OK
-
-Parameters
-^^^^^^^^^^
-
--  **<operation>**:
-
-   -  0: release user's RAM
-   -  1: malloc user's RAM
-   -  2: write user's RAM
-   -  3: read user's RAM
-   -  4: clear user's RAM
-
--  **<size>**: the size to malloc/read/write
--  **<offset>**: the offset to read/write. Default: 0
-
-Notes
-^^^^^
-
--  Please malloc the RAM size before you perform any other operations.
--  If the operator is ``write``, wrap return ``>`` after the write command, then you can send the data that you want to write. The length should be parameter ``<length>``.
--  If the operator is ``read`` and the length is bigger than 1024, ESP-AT will reply multiple times in the same format, each reply can carry up to 1024 bytes of data, and eventually end up with ``\r\nOK\r\n``.
-
-Example
-^^^^^^^^
-
-::
-
-    // malloc 1 KB user's RAM
-    AT+USERRAM=1,1024
-
-    // write 500 bytes to RAM (offset: 0)
-    AT+USERRAM=2,500
-
-    // read 64 bytes from RAM offset 100
-    AT+USERRAM=3,64,100
-
-    // free the user's RAM
-    AT+USERRAM=0
-
 .. _cmd-SYSFLASH:
 
 :ref:`AT+SYSFLASH <Basic-AT>`: Query/Set User Partitions in Flash

docs/en/AT_Command_Set/TCP-IP_AT_Commands.rst

@@ -6,7 +6,8 @@ TCP/IP AT Commands
 :link_to_translation:`zh_CN:[中文]`
 
 -  :ref:`AT+CIPV6 <cmd-IPV6>`: Enable/disable the network of Internet Protocol Version 6 (IPv6).
--  :ref:`AT+CIPSTATUS <cmd-STATUS>`: Obtain the TCP/UDP/SSL connection status and information.
+-  :ref:`AT+CIPSTATE <cmd-IPSTATE>`: Obtain the TCP/UDP/SSL connection information.
+-  :ref:`AT+CIPSTATUS (deprecated) <cmd-STATUS>`: Obtain the TCP/UDP/SSL connection status and information.
 -  :ref:`AT+CIPDOMAIN <cmd-DOMAIN>`: Resolve a Domain Name.
 -  :ref:`AT+CIPSTART <cmd-START>`: Establish TCP connection, UDP transmission, or SSL connection.
 -  :ref:`AT+CIPSTARTEX <cmd-STARTEX>`: Establish TCP connection, UDP transmission, or SSL connection with an automatically assigned ID.
@@ -96,11 +97,54 @@ Notes
 
 -  You should enable IPv6 network before using IPv6 related upper layer AT commands (TCP/UDP/SSL/PING/DNS based on IPv6 network, also known as TCP6/UDP6/SSL6/PING6/DNS6 or TCPv6/UDPv6/SSLv6/PINGv6/DNSv6).
 
-.. _cmd-STATUS:
+.. _cmd-IPSTATE:
 
-:ref:`AT+CIPSTATUS <TCPIP-AT>`: Obtain the TCP/UDP/SSL Connection Status and Information
+:ref:`AT+CIPSTATE <TCPIP-AT>`: Obtain the TCP/UDP/SSL Connection Information
 ----------------------------------------------------------------------------------------
 
+Query Command
+^^^^^^^^^^^^^^^
+
+**Command:**
+
+::
+
+    AT+CIPSTATE?
+
+**Response:**
+
+When there is a connection, AT returns:
+
+::
+
+    +CIPSTATE:<link ID>,<"type">,<"remote IP">,<remote port>,<local port>,<tetype>
+
+    OK
+
+When there is no connection, AT returns:
+
+::
+
+    OK
+
+Parameters
+^^^^^^^^^^
+
+-  **<link ID>**: ID of the connection (0~4), used for multiple connections.
+-  **<"type">**: string parameter showing the type of transmission: "TCP", "TCPv6", "UDP", "UDPv6", "SSL", or "SSLv6".
+-  **<"remote IP">**: string parameter showing the remote IPv4 address or IPv6 address.
+-  **<remote port>**: the remote port number.
+-  **<local port>**: the local port number.
+-  **<tetype>**:
+
+   -  0: ESP runs as a client.
+   -  1: ESP runs as a server.
+
+.. _cmd-STATUS:
+
+:ref:`AT+CIPSTATUS (deprecated) <TCPIP-AT>`: Obtain the TCP/UDP/SSL Connection Status and Information
+-----------------------------------------------------------------------------------------------------
+
 Execute Command
 ^^^^^^^^^^^^^^^
 

docs/en/AT_Command_Set/index.rst

@@ -20,6 +20,7 @@ Here is a list of AT commands. Some of them can only work on the ESP32 series, s
    [ESP8266 Only] Signaling Test AT Commands <Signaling_Test_AT_Commands>
    Web server AT Commands <Web_server_AT_Commands>
    [ESP32 & ESP32S2 & ESP32-C3] Driver AT Commands <Driver_AT_Commands>
+   User AT Commands <user_at_commands>
    AT Command Set Comparison <AT_Command_Set_Comparison>
 
 It is strongly recommended to read the following sections for some common information on AT commands before you dive into the details of each command.