sys/stdio_nimble: add version note to README

sys/include/stdio_nimble.h

@@ -10,10 +10,6 @@
  * @defgroup     sys_stdio_nimble STDIO over NimBLE
  * @ingroup      sys_stdio
  *
- * To enable stdio over nimBLE, add the module `stdio_nimble`:
- *
- *     USEMODULE += stdio_nimble
- *
  * @experimental This feature is experimental as some use-cases, such as examples/twr_aloha, show
  *               unexpected behaviour.
  *
@@ -25,6 +21,140 @@
  *               write buffer since only 'stdio_write' uses this mutex. Characters will be written
  *               in FIFO mode. Characters that do not fit in the buffer will be dropped.
  *
+ * This module uses NimBLE for stdio. The bluetooth characteristic for
+ * stdin is writable and the characteristic for stdout uses the indicate
+ * mechanism to publish the system's output to a connected device. Data will be
+ * sent out asynchronously via callout functions.
+ *
+ * To use this module, add
+ * ```
+ * USEMODULE += stdio_nimble
+ * ```
+ * to your makefile.
+ *
+ * You can change the default buffer sizes by adding
+ * ```
+ * CFLAGS += -DCONFIG_STDIO_NIMBLE_STDIN_BUFSIZE=1024
+ * CFLAGS += -DCONFIG_STDIO_NIMBLE_STDOUT_BUFSIZE=2048
+ * ```
+ * to your makefile.
+ *
+ * **NOTE:** These values must be a power of two!
+ *
+ * By default, stdin and stdout buffers are cleared on a connect event. To keep the
+ * content add the following to your makefile:
+ * ```
+ * CFLAGS += -DCONFIG_STDIO_NIMBLE_CLEAR_BUFFER_ON_CONNECT=0
+ * ```
+ *
+ * For automatic bluetooth advertising a module is provided: *nimble_autoadv*.
+ * It will take care of enabling advertising on disconnect events and
+ * disabling advertising on connect events. It can be enabled by adding
+ * ```
+ * USEMODULE += nimble_autoadv
+ * ```
+ * to your makefile.
+ *
+ * The advertised device name can then optionally be configured with
+ * ```
+ * CFLAGS += -DCONFIG_NIMBLE_AUTOADV_DEVICE_NAME='"Riot OS device"'
+ * ```
+ * Otherwise the device will appear as "*RIOT OS device*".
+ *
+ * ## Instructions to connect to the bluetooth shell via ble-serial
+ *
+ * ### Configure and compile shell app
+ * This example is for the `nrf52840dongle` target in `tests/sys/shell`, other
+ * targets that are supported by NimBLE can be used similarly.
+ *
+ * Add following to Makefile:
+ * ```
+ * BOARD = nrf52840dongle
+ * USEMODULE += nimble_autoadv
+ * USEMODULE += stdio_nimble
+ * ```
+ *
+ * **NOTE:** You can also have a look at `tests/sys/shell_ble`, which is already
+ * set up for NimBLE.
+ *
+ * ### Flash
+ *
+ * ```
+ * $ make -C tests/sys/shell -j clean all flash
+ * ```
+ *
+ * ### Install the ble-serial tool
+ *
+ * ```
+ * $ pip install ble-serial
+ * ```
+ *
+ * ### Scan for your device
+ * To connect to the device, you have to find out the BLE address. For this
+ * example, the device name is `Riot OS device`. For the `tests/sys/shell_ble`
+ * test, the device name is `tests/sys/shell_ble`.
+ * When you get an `ble-scan: command not found` error you can also run
+ * `python -m ble_serial.scan` instead.
+ *
+ * **NOTE:** Windows and Linux use MAC addresses instead of the UUIDs.
+ *
+ * ```
+ * $ ble-scan
+ * Started BLE scan
+ *
+ * 6BE8174C-A0F8-4479-AFA6-9828372CAFE9 (RSSI=-40): Riot OS device
+ * A2862DCB-D382-4C0B-95BF-FA9A961F8D88 (RSSI=-48): Unknown
+ * F2C75C08-7DD7-4F43-BEF0-151C92068FE5 (RSSI=-66): Unknown
+ * 69400683-FBE5-4B45-8CFE-98594076E5F4 (RSSI=-89): Unknown
+ * ```
+ *
+ * ### Discover characteristics (check the one advertised by the gatt server stdin/stdout)
+ * ```
+ * $ ble-scan -d 6BE8174C-A0F8-4479-AFA6-9828372CAFE9
+ * Started deep scan of 6BE8174C-A0F8-4479-AFA6-9828372CAFE9
+ *
+ * SERVICE e6d54866-0292-4779-b8f8-c52bbec91e71 (Handle: 10): Unknown
+ *      CHARACTERISTIC 35f28386-3070-4f3b-ba38-27507e991762 (Handle: 11): Unknown ['indicate']
+ *          DESCRIPTOR 00002902-0000-1000-8000-00805f9b34fb (Handle: 13): Client Characteristic
+ * Configuration
+ *      CHARACTERISTIC ccdd113f-40d5-4d68-86ac-a728dd82f4aa (Handle: 14): Unknown ['write']
+ *
+ * Completed deep scan of 6BE8174C-A0F8-4479-AFA6-9828372CAFE9
+ * ```
+ *
+ * ### Create a virtual port and mount it on /tmp/dev_riot_ble
+ *
+ * **NOTE:** for older versions (`<=2.8.0`) of `ble-serial`, the command line option
+ * `--write-with-response` is unsupported and has to be removed!
+ *
+ * ```
+ * $ ble-serial -d 6BE8174C-A0F8-4479-AFA6-9828372CAFE9 -p /tmp/dev_riot_ble
+ * --write-uuid ccdd113f-40d5-4d68-86ac-a728dd82f4aa
+ * --read-uuid 35f28386-3070-4f3b-ba38-27507e991762 --write-with-response
+ *
+ * 17:44:18.765 | INFO | linux_pty.py: Slave created on /tmp/dev_riot_ble -> /dev/ttys006
+ * 17:44:18.766 | INFO | ble_interface.py: Receiver set up
+ * 17:44:18.766 | INFO | ble_interface.py: Trying to connect with 6BE8174C-A0F8-4479-AFA6-
+ * 9828372CAFE9
+ * 17:44:19.861 | INFO | ble_interface.py: Device 6BE8174C-A0F8-4479-AFA6-9828372CAFE9 connected
+ * 17:44:19.862 | INFO | ble_interface.py: Found write characteristic ccdd113f-40d5-4d68-86ac-
+ * a728dd82f4aa (H. 14)
+ * 17:44:19.862 | INFO | ble_interface.py: Found notify characteristic 35f28386-3070-4f3b-ba38-
+ * 27507e991762 (H. 11)
+ * 17:44:19.883 | INFO | main.py: Running main loop!
+ * ```
+ *
+ * ### Open the virtual com port (the port name is from the logs in previous steps)
+ * ```
+ * $ picocom -q -b 115200 --imap lfcrlf /tmp/dev_riot_ble
+ * > ps
+ *     pid | state    Q | pri
+ *       1 | running  Q |   7
+ *       2 | bl anyfl _ |   5
+ *       3 | bl anyfl _ |   0
+ * >
+ * ```
+ *
  * @{
  * @file
  *

tests/sys/shell_ble/README.md

@@ -3,7 +3,8 @@ testing via blueooth instead of UART. You have to set up a virtual serial port
 manually.
 
 For instructions on how to open a virtual serial port to your bluetooth device
-see `sys/stdio_nimble/README`.
+see the documentation of `sys/stdio_nimble` in
+`System > STDIO abstraction > STDIO over NimBLE`.
 
 **Note:** `make term` and `make test-with-config` will open two different types of terminals.
 - When calling `make term` then a terminal will communicate with the board