Update the CoAP section of the cc26xx web demo readme

examples/platform-specific/cc26xx/cc26xx-web-demo/README.md

@@ -54,33 +54,38 @@ tab, as per the image below.
 
 CoAP Server
 -----------
-For this functionality to work, you will need to install the
-[Copper (Cu)](https://addons.mozilla.org/en-US/firefox/addon/copper-270430/)
-addon to your browser.
+For this functionality to work, you will need to install a CoAP client.
+You can achieve this by following the guides on how to set up your system
+[in the wiki](https://github.com/contiki-ng/contiki-ng/wiki#setting-up-contiki-ng).
 
-From the sensors tab in the 6lbr web page, click the 'coap' link in the line
-corresponding to your CC26xx device. Once the addon fires up, select
-".well-known/core" in the left pane and then hit the 'Get' button at the top.
+You should start by sending a CoAP GET request for the `.well-known/core`
+resource. If you are using libcoap's CoAP client, this can be achieved by:
 
-![CoAP Resources](img/coap-resources.png)
+```
+coap-client -m get coap://[<device IPv6 address here>]/.well-known/core
+```
+
+Adjust the above command to match the command line arguments of your CoAP
+client.
 
 The Device will respond with a list of all available CoAP resources. This list
-will be different between the Srf and the SensorTag. The screenshot below shows
-a (partial) list of resources exported by the SensorTag CoAP server. Select
-a resource on the left pane and hit 'Get' to retrieve its value. Select
-`lt/g` and hit 'Post' to toggle the green LED, `lt/r` for the red one.
+will be different between the various CC13x0/CC26x0 boards.
 
-You can also use CoAP to enable/disable BLE advertisements! Select
-`dev/ble_advd` and then hit the "Outgoing" button in the payload panel. Type in
-the desired payload, which can be:
+Send a CoAP GET request for any of those resrouces to retrieve its value.
+
+Send a CoAP POST to the `lt/g` or `lt/r` to toggle the green/red LED
+respectively.
+
+You can also use CoAP to enable/disable BLE advertisements! This can be done
+by sending a PUT or POST request to the `dev/ble_advd` resource. Your request
+should contain the desired payload, which can be:
 
 * `mode=on|off`
 * `name=<name>`
 * `interval=<secs>`
 
-or a combination of both delimited with an amp. For example, you can set as
-payload `mode=on&name=My CC26xx Device 4&interval=5`. Once you have set the
-payload, hit either the POST or PUT button.
+or a combination of the above delimited with an amp. For example, you can set
+as payload `mode=on&name=My CC26xx Device 4&interval=5`.
 
 Bear in mind that you must set `name` at least once before enabling BLE
 advertisements. If you fail to do so, the RF will refuse to enter BLE mode and