Update README for CC3200 examples

PUBLISHED_FROM=53ce21efbb0e769089293b1aa11d2b2f3136161d

examples/CC3200/ccs/README.md

@@ -1,11 +1,57 @@
-This directory contains Code Composer Studio projects for Mongoose.
+# Code Composer Studio example projects
 
- - Mongoose: the library project, produces a static library (`Mongoose.a`).
+To run them you will need:
+ - [CC3200-LAUNCHXL](http://www.ti.com/tool/cc3200-launchxl) dev board.
+ - [CC3200SDK 1.2.0](http://www.ti.com/tool/cc3200sdk) installed in `TI_PRODUCTS_DIR/CC3200SDK_1.2.0` (typically `C:\ti\CC3200SDK_1.2.0` on Windows, `/home/USER/ti/CC3200SDK_1.2.0` on Linux).
+ - The latest CC3200SDK-SERVICEPACK should also be installed and flashed to the device
+ - Code Composer Studio 6 IDE
+ - Mongoose source code. Either clone the [Git repo](https://github.com/cesanta/mongoose.git) or download the [ZIP archive](https://github.com/cesanta/mongoose/archive/master.zip).
 
- - MG_sensor_demo: a demo application that serves files from SLFS and outputs
-   sensor data to the WebSocket connection. It uses the Mongoose library project,
-   so you'll need to import both.
+## Mongoose - The library project
+This project produces `Mongoose.lib` - a static library meant to be used by other projects.
+Feel free to use it as a dependency for your own projects or just copy `mongoose.c` and `mongoose.h`.
+Note that by default a lot of features are enabled, including file serving (which we use in our examples).
+You can trim a lot of fat by turning various build options off.
+A minimal HTTP serving configuration is about 25 K (compiled for ARM® Cortex®M4 with GCC 4.9 with size optimization on).
 
-CC3200SDK_1.2.0 needs to be installed in ${TI_PRODUCTS_DIR} (`C:\TI` on Windows, `~/ti` on Linux).
+## MG_hello - A simple demo
+MG_hello project is a simple web server that serves files from the SimpleLink file system and allows them to be uploaded.
+This project depends on the Mongoose library project, make sure you import them both.
+When importing, ensure the “copy project to workspace” checkbox is *unchecked*, otherwise file references will be broken.
 
-*Note:* When importing projects, make sure the `Copy projects into workspace` checkbox is *not* checked.
+When built and run on the device, by default, the example will set up a Wi-Fi network called “Mongoose” (no password).
+
+Assuming everything works, you should see the following output in CIO:
+
+```
+main                 Hello, world!
+mg_init              MG task running
+mg_init              Starting NWP...
+mg_init              NWP started
+wifi_setup_ap        WiFi: AP Mongoose configured
+```
+
+Note: If the demo does not proceed past “Starting NWP…”, please reset the board (possibly related to [this](https://e2e.ti.com/support/wireless_connectivity/simplelink_wifi_cc31xx_cc32xx/f/968/p/499123/1806610#1806610) and our [workaround](https://github.com/cesanta/mongoose/commit/848c884fff80de03051344e230392a68d4b51b84) is not always effective).
+
+And after connecting to Wi-Fi network Mongoose, the following page on http://192.168.4.1/:
+
+<img src="upload_form.png" width="364" height="239">
+
+Pick a small file (say favicon.ico) and upload.
+You should get “Ok, favicon.ico - 16958 bytes.” and it will be served back to you ([link](http://192.168.4.1/)).
+If you upload index.html, it will be served instead of the form (but the form will be accessible at [/upload](http://192.168.4.1/upload)).
+
+## MG_sensor_demo - A more elaborate demo project
+
+This demo shows the use of [timers](https://docs.cesanta.com/mongoose/latest/#/c-api/net.h/mg_set_timer/) and serving a WebSocket data stream to (potentially) multiple subscribers.
+Data from the on-board temperature sensors and accelerometer is streamed to any clients connected over WebSocket, which allows building of responsive, near-real time dashboards.
+
+The main [event handler function](https://github.com/cesanta/mongoose/blob/master/examples/CC3200/main.c#L81) in main.c does everything MG_hello’s function does, but also handles the websocket connection event - when `MG_EV_WEBSOCKET_HANDSHAKE_DONE` arrives, it switches the event handler to a different one - data_conn_handler (defined [here](https://github.com/cesanta/mongoose/blob/master/examples/CC3200/data.c#L144) in data.c). Doing this is not required, but it keeps the code modular and function size manageable.
+
+Data acquisition is performed at regular intervals by a timer. Mongoose timers are not very accurate (remember - everything is executed in single thread), but good enough for this case.The timer is first set [in mg_init()](https://github.com/cesanta/mongoose/blob/master/examples/CC3200/main.c#L200), and the `MG_EV_TIMER` event is handled [in the main handler](https://github.com/cesanta/mongoose/blob/master/examples/CC3200/main.c#L123). Mongoose timers must be re-armed manually.
+
+To try this demo from Code Composer Studio IDE, follow the steps above for MG_hello. Same as for MG_hello, you will only see an upload for initially. Please upload `main.js` and `index.html` from the [slfs directory](https://github.com/cesanta/mongoose/tree/master/examples/CC3200/slfs) and reload the page. You should see something like this:
+
+<img src="sensor_demo.png" width="770" height="856">
+
+[This short video](https://youtu.be/T0aFUKIBZxk) shows the demo in action.