Clean up the "empty buffer" code in frame/frame-layer.go

[stamp]

The problem to be aware of is that Read() is a blocking call. So it will block until we receive data.

Startup of the library should work something like this:

1. Open the port
2. Read all in the buffer and throw it away! (All this data is old and buffered by the kernel)
3. When no data has been received for a customizable time continue
4. Start reading and forward the data to the rest of the library

The important part here is that we want to throw away everything that has been buffered by the kernel before we start communicating with the zwave-controller

[juliandroid]

It seems you are hitting the same issue as I do, so you can follow the issue: golang/go#22114

In my bug report ( golang/go#22100 ) I have mentioned a workaround with syscalls ( https://play.golang.org/p/k5R8RcMPwg ), but not sure how helpful that is for you (Linux only).