[nrf fromlist] samples: bluetooth: iso: Extend sample documentation

Extend the sample documentation for the central and peripheral
iso samples so that they become easier to get started with.

Upstream PR: zephyrproject-rtos/zephyr#68870

Signed-off-by: Rubin Gerritsen <[email protected]>

samples/bluetooth/central_iso/README.rst

@@ -6,24 +6,41 @@ Bluetooth: Central ISO
 Overview
 ********
 
-Application demonstrating a connected isochronous channel functional as the
-central role, by scanning for peripheral devices and establishing a connection
-to the first one with a strong enough signal.
-The application then attempts to setup a connected isochronous channel and
-starts sending data.
+This sample demonstrates how to use an isochronous channel as a central.
+The sample scans for a peripheral, establishes a connection, and sets up a connected isochronous channel to it.
+Once the isochronous channel is connected, isochronous data is transferred to the peer device every 10 milliseconds.
+It is recommended to run this sample together with the :ref:`Bluetooth: Peripheral ISO <peripheral_iso>` sample.
 
+To run the sample with an encrypted isochronous channel, enable :kconfig:option:`CONFIG_BT_SMP`.
 
 Requirements
 ************
 
 * BlueZ running on the host, or
 * A board with Bluetooth Low Energy 5.2 support
 * A Bluetooth Controller and board that supports setting
-  CONFIG_BT_CTLR_CENTRAL_ISO=y
+  :kconfig:option:`CONFIG_BT_CTLR_CENTRAL_ISO`.
 
 Building and Running
 ********************
 This sample can be found under :zephyr_file:`samples/bluetooth/central_iso` in
 the Zephyr tree.
 
-See :ref:`bluetooth samples section <bluetooth-samples>` for details.
+1. Start the application.
+   In the terminal window, check that it is scanning for other devices.
+
+      Bluetooth initialized
+      Scanning successfully started
+      Device found: D3:3A:5D:F5:73:33 (random) (RSSI -78)
+      Device found: 70:7B:F4:2B:76:AD (random) (RSSI -68)
+      Device found: 65:CF:20:0D:CB:9D (random) (RSSI -82)
+
+2. Observe that the device connects.
+
+      Connected: 65:CF:20:0D:CB:9D (random)
+
+3. Observe that the ISO channel is connected
+
+      ISO Channel 0x200048f8 connected
+
+See :ref:`bluetooth samples section <bluetooth-samples>` for more details.

samples/bluetooth/peripheral_iso/README.rst

@@ -6,9 +6,10 @@ Bluetooth: Peripheral ISO
 Overview
 ********
 
-Similar to the :ref:`Peripheral <ble_peripheral>` sample, except that this application enables
-support for connected isochronous (ISO) channels.
-
+This sample demonstrates how to use isochronous channels as a peripheral.
+The sample starts advertising, waits for a central to connect to it and set up an isochronous channel.
+Once the isochronous channel is set up, received isochronous data is printed out.
+It is recommended to run this sample together with the :ref:`Bluetooth: Central ISO <bluetooth_central_iso>` sample.
 
 Requirements
 ************
@@ -23,4 +24,43 @@ Building and Running
 
 This sample can be found under :zephyr_file:`samples/bluetooth/peripheral_iso` in the Zephyr tree.
 
-See :ref:`bluetooth samples section <bluetooth-samples>` for details.
+1. Start the application.
+   In the terminal window, check that it is advertising.
+
+      Bluetooth initialized
+      Advertising successfully started
+
+2. Observe that the central device connects and sets up an isochronous channel.
+
+      Connected E8:DC:8D:B3:47:69 (random)
+      Incoming request from 0x20002260
+      ISO Channel 0x20000698 connected
+
+3. Observe that incoming data is printed.
+
+      Incoming data channel 0x20000698 len 1
+               00
+      Incoming data channel 0x20000698 len 2
+               0001
+      Incoming data channel 0x20000698 len 3
+               000102
+      Incoming data channel 0x20000698 len 4
+               00010203
+      Incoming data channel 0x20000698 len 5
+               0001020304
+      Incoming data channel 0x20000698 len 6
+               000102030405
+      Incoming data channel 0x20000698 len 7
+               000102...040506
+      Incoming data channel 0x20000698 len 8
+               000102...050607
+      Incoming data channel 0x20000698 len 9
+               000102...060708
+      Incoming data channel 0x20000698 len 10
+               000102...070809
+      Incoming data channel 0x20000698 len 11
+               000102...08090a
+      Incoming data channel 0x20000698 len 12
+               000102...090a0b
+
+See :ref:`bluetooth samples section <bluetooth-samples>` for more details.