E20 Example - SN173 Demo GUI Server

This demonstration kit showcases the following products:

• SNAP Connect E20 (using DHCP on the Ethernet Port and the SNAP radio)
• SN173 Prototyping board with SM220 module

What This Example Does

The SNAP Connect E20 gateway serves up a webpage displaying an image of a Synapse SN173 Prototyping board with buttons and LEDs that can be clicked on to change the state of a physical SN173. Pressing the buttons on the physical SN173 will also update the LEDs on the webpage in realtime.

Full source code for this example is available on GitHub here:

https://github.com/synapse-wireless/sn173-demo-gui-server

The Synapse Portal IDE will allow complete embedded module development, as well as wireless sniffer capability – download the latest version here:

https://forums.synapse-wireless.com/showthread.php?t=9

Gateway Server Installation

The kit (or assembled parts) is upgradeable to the demonstration application. Simply power up the E20 and load the software onto the E20 in the snap user directory.

Install the required dependencies using pip:

sudo pip install snapconnect -i https://update.synapse-wireless.com/pypi/ 
sudo pip install tornado

You then must edit the SN173_Demo_Server.py file to change the SN173_Addr to your SN173 MAC address:

# Enter the address for the target SN173 board here:
SN173_Addr = "\x06\x27\x01"   

Finally, run the application by executing the script as sudo:

sudo python SN173_Demo_Server.py

SN173 Script Installation

First, download and install Portal and copy the SN173DemoLedBtns.py to your Portal/snappyImages directory. Connect the SN173 to your PC via the mini-USB port. Now you can connect Portal to the SN173 as a bridge node and download the script (SN173DemoLedBtns.py). Use a PC or mobile device to connect to the E20’s IP address in your browser (Note you will need to be on the same network):

To find your E20’s IP address consult the E20 User’s Guide for login information and issue the command:

ifconfig

to locate the IP address assigned to your Ethernet Port.

Open a web browser, and point to the E20’s URL: http://[E20_IP_Addr]

The web page will display a picture SN173 board. You can click the buttons in the web page to enable the LEDs 1-4 or you can click the buttons on the SN173. The two interfaces remain in sync because the SN173 sends a message on each button press (physical or virtual) that the gateway hears and updates the status of the LEDs. The SN173 also sends a message every 10 seconds to notify the gateway of the LED status.

Why Tornado?

For more information on why Tornado is used as SNAPconnect's scheduler, please take a look at the TORNADO.md file in this repo.

License

This example is available under Apache License version 2.0. See LICENSE.md for more information.