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Excellent link to full AT commands supported by the chipset: https://room-15.github.io/blog/2015/03/26/esp8266-at-command-reference/
Example connecting to Wifi Network using AT commands over the serial interface*:
1. AT
This is just a hello message, and if the ESP-12 is in the correct mode, it will return an "OK" message.
2. AT+GMR
This command returns the firmware version currently on the chip.
3. AT+CWMODE?
This command returns the mode of operation. If the mode is not 3, we will change it to 3 using the following command :
AT+CWMODE=3
This mode makes the ESP8266 behave both as a WiFi client as well as a WiFi Access point.
4. AT+CWLAP
The LAP (List Access Points) lists the WiFi networks around. Next, we choose our WiFi network
5. AT+CWJAP="your_network_name","your_wifi_network_password"
This command JAP (Join Access Point) makes the ESP-12 join your WiFi Network.
6. AT+CIFSR
This command returns the IP address of the ESP-12 as the second line and the gateway IP address as the first line if it managed to connect successfully.
*NOTE: Vetco does not know how to hook up or program any Arduino or Raspberry Pi modules or main boards. The above are borrowed instructions from elsewhere on the internet. We are unable to provide assistance with these matters. There is plenty of information you can find on the internet about these and many more modules.