End of stream detection missing

[sp5wwp]

Since our implementation doesn't use tags, there is no way the encoder block could tell there's no more data to encode. This results in missing End of Transmission frame. I suspect the Frame Number of the last frame doesn't get its MSB set to 1 either.

[lwvmobile]

I don't suppose there is a way to implement a PTT button in GNURadio blocks that can signal that sort of thing, or if you did if it would require significant code changes to implement.

[sp5wwp]

PTT signal is not needed. It is enough that the data source would mark the end of the data stream with a tag.

[jmfriedt]

See jmfriedt@0b5e5e4 for an attempt at adding message passing to send an end-of-transmission information to the transmitter block. The GNU Radio flowgraph does not seem to be terminated when the block returns -1 though as would be expected from https://lists.gnu.org/archive/html/discuss-gnuradio/2017-01/msg00034.html whose outcome is not clear.