Hidraw is an Elixir interface to Linux hidraw devices.
Hidraw can be used to monitor /dev/hidraw* devices and report raw data to
the parent process.
Start by looking for the device you want to monitor.
iex> Hidraw.enumerate
[
{"/dev/hidraw2", "ﾩSymbol Technologies, Inc, 2002 Symbol Bar Code Scanner"},
{"/dev/hidraw1", "DLL082A:01 06CB:76AF"},
{"/dev/hidraw0", "ELAN Touchscreen"}
]Here we have a Barcode scanner at /dev/hidraw2, lets open it.
iex> Hidraw.start_link "/dev/hidraw2"
{:ok, #PID<0.197.0>}
The first message we will receive is the device's report descriptor
iex> flush
{:hidraw, "/dev/hidraw2",
{:report_descriptor,
<<6, 69, 255, 10, 0, 75, 161, 1, 10, 1, 74, 117, 8, 149, 11, 21, 0, 38, 255,
0, 145, 2, 10, 2, 74, 149, 64, 129, 2, 192>>}}All subsequent messages will be triggered off device events. Here I am scanning a barcode:
iex(4)> flush
{:hidraw, "/dev/hidraw2",
<<16, 16, 3, 0, 65, 67, 67, 49, 55, 49, 49, 50, 79, 0, 24, 11, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
...>>}
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