Technical information

Chapter 2: AT+i Commands Reference
May 31, 2008 AT+i Commands Reference Manual 2-77
The configuration site includes web forms to monitor and update most W24 parameters and an
upload page consisting of file upload forms. Note that, the following W24 parameters cannot be
configured remotely and are therefore not displayed on W24's configuration website:
• WiFi security parameters
• Fast USART parameter (BDRD)
• Analog-to-digital converter (ADC) parameters
Each upload form allows file uploading using the POST method for a single file. The forms
support uploading the following files:
• Firmware update *.imz file
• Parameters update *.rpf file
• Packed application website *.img file
When new firmware (*.imz file) is uploaded to W24, W24 submits an acknowledgment page to
the browser, after receiving the complete *.imz file, and then goes offline and updates its
firmware.
In some rare cases, W24's internal configuration website may be accidentally corrupted. This
happens when W24 fails to complete a remote firmware update process via web. To resolve this
problem, W24 includes a recovery website. This website allows a user at the remote browser end
to upload the .imz file again in order to restore W24's internal website.
W24's configuration site is located at:
HTTP://<W24_IP_Address>/w24/
Host Interaction Mode
Host Interaction mode allows OEMs to design and implement a product-related embedded
website that is managed by W24 on behalf of the host. The host-defined embedded website
supports live host parameter monitoring and updating by a remote browser. This is achieved by a
dynamic AT+i layer implemented across the serial link between the host and W24.
The application developer creates a website using conventional web authoring tools. The HTML
or WAP files can then be edited to contain Parameter Tags. Parameter tags are regarded as
placeholders in HTML or WAP files. They are replaced on-the-fly with real-time values as the
page is served to the browser. Browsers may also change values of Parameter Tags in order to
submit the value back to the host via W24. This is done by defining the Parameter Tag in the
NAME field in an HTML FORM (without the (~) characters). The W24 WPWD parameter is
used to password-protect remote Parameter Tags update. See Security and Restrictions.
Once a website is created and Parameter Tags are edited in, the site is packed and uploaded to
W24. The website is linked into the W24 firmware, automatically expanding the existing AT+i
command set to encompass the website Parameter Tags. This happens when the web server is
activated using the +iWWW command.
Extended AT+i commands have the following syntax:
> AT+i<param>=<value>
> AT+i<param>?
for setting and querying Parameter Tag values, respectively.
For example, the ~temperature~ Parameter Tag referenced in a web page, can be set using:
> AT+itemperature='45 Deg.'