• Introduction
  • Features
  • Hardware Specifications
  • Dimensions
  • Layout
  • Interfaces
  • Application
• Basic Usage
  • Management Software
    • Connection with a PC
    • Initial Setup and Certificates
    • Firmware Upgrade
  • Reset
• MQTT Usage
  • Preparation
    • File System
    • AT Commands
    • Connecting Devices
  • MQTT Settings
    • Topic and Message Buffer
    • Timeout
    • Connection Flags
    • Connection Payload
    • QoS
  • Connecting to Broker
  • SUBSCRIBE
  • PUBLISH
  • Reading Messages
  • Etc.
    • Reading the Client ID
    • Setting Short Response
• Advanced
  • ATC & MQTT Settings
  • Activating PHPoC Engine
  • Advanced AT Commands

Advanced AT Commands

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You can read or change IP address-related settings for P4M-440G using AT commands.

• IP Address-related Settings

  Item	Descriptoin
  dhcp	Obtain an IP address automatically(1: Enable, 0: Disable)
  ipaddr	IP Address
  netmask	Subnet Mask
  gwaddr	Gateway IP Address
  nsaddr	DNS IP Address

These settings are stored in a buffer called "envs." Therefore, you need to use AT commands related to "envs" to access each item.

Reading an envs item: +ESR

You can use this command to read a specific item from "envs."

• Command Format

AT+ESR="<Item>"

• An example: Reading the IP address

at+esr="ipaddr"
+ESR:203.0.113.0
OK

Loading the envs: +EBL

• Command Format

AT+EBL="envs"

• An example

at+ebl="envs"
OK

Storing the envs: +EBS

• Command Format

AT+EBS="envs",0xa5c3

• An example

at+ebs="envs",0xa5c3
OK

Modifying an envs item: +EBW

• Command Format

AT+EBW="<Item>","<Value>"
AT+EBW="<Item>",<Value>

• An example: Enabling the DHCP

at+ebl="envs"
OK
at+ebw="dhcp",1
OK
at+ebs="envs",0xa5c3
OK

• An example: Using a static IP address (203.0.113.0)

at+ebl="envs"
OK
at+ebw="dhcp",0
OK
at+ebw="ipaddr","203.0.113.0"
OK
at+ebw="netmask","255.255.255.0"
OK
at+ebs="envs",0xa5c3
OK

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