libusb: copywriting

port/libusb/README.md

@@ -1,12 +1,24 @@
-# BTstack Port for POSIX Systems with libusb library
+# BTstack Port for POSIX Systems with libusb Library
 
+## Compilation
 The quickest way to try BTstack is on a Linux or OS X system with an
 additional USB Bluetooth dongle. It requires
 [pkg-config](http://www.freedesktop.org/wiki/Software/pkg-config/)
 and [libusb-1.0](http://libusb.info) or higher to be
 installed.
 
-On Linux, the USB Bluetooth donle is usually not accessible to a regular user. You can:
+On a recent Debian-based system, all you need is:
+
+	apt-get install gcc git libusb-1.0 pkg-config
+
+
+When everything is ready, you compile all examples with:
+
+	make
+
+## Environment
+
+On Linux, the USB Bluetooth dongle is usually not accessible to a regular user. You can either:
 - run the examples as root
 - add a udev rule for your dongle to extend access rights to user processes
 
@@ -21,10 +33,42 @@ To add an udev rule, please create `/etc/udev/rules.d/btstack.rules` and add thi
 	# Match Asus BT400
 	SUBSYSTEM=="usb", ATTRS{idVendor}=="0b05", ATTRS{device}=="17cb", MODE="0666"
 
-On OS X, it’s necessary to tell the OS to only use the internal
-Bluetooth. For this, execute:
+
+On macOS, the OS will try to use a plugged-in Bluetooth Controller if one is available. 
+It's best to to tell the OS to always use the internal Bluetooth Contoller. 
+
+For this, execute:
 
     sudo nvram bluetoothHostControllerSwitchBehavior=never
 
-and then reboot to activate the change.
+and then reboot to activate the change. 
 
+## Running the examples
+
+BTstack's HCI USB transport will try to find a suitable Bluetooth module and use it. 
+
+On start, BTstack will try to find a suitable Bluetooth module. It will also print the path to the packet log as well as the USB path.
+
+	$ ./le_counter
+	Packet Log: /tmp/hci_dump.pklg
+	BTstack counter 0001
+	USB Path: 06
+	BTstack up and running on 00:1A:7D:DA:71:13.
+
+If you want to run multiple examples at the same time, it helps to fix the path to the used Bluetooth module by passing -u usb-path to the executable.
+
+Example running le_streamer and le_streamer_client in two processes, using Bluetooth dongles at USB path 6 and 4:
+
+	./le_streamer -u 6
+	Specified USB Path: 06
+	Packet Log: /tmp/hci_dump_6.pklg
+	USB Path: 06
+	BTstack up and running on 00:1A:7D:DA:71:13.
+	To start the streaming, please run the le_streamer_client example on other device, or use some GATT Explorer, e.g. LightBlue, BLExplr.
+
+	$ ./le_streamer_client -u 4
+	Specified USB Path: 04
+	Packet Log: /tmp/hci_dump_4.pklg
+	USB Path: 04
+	BTstack up and running on 00:1A:7D:DA:71:13.
+	Start scanning!