Does anyone have methods to write messages to a file? My use case is tagging 
baseband sample numbers of the start/end of WLAN packets in gr-ieee80211.  It 
looks like typically people create custom blocks to deal with this such as 
messages to Wireshark.  For general metadata to go along with blobs, I think it 
makes sense to have a (blob,dictionary) pmt tuple as the message, much like 
gr-ieee80211.  I’ve implemented a file message sink block based on this premise 
which takes a list of dictionary keys in such a message and writes them to a 
csv file.  If anyone is interested I can roll it up into a feature request on 
gnuradio.org.

https://github.com/garverp/gnuradio/tree/msg_file_sink 
<https://github.com/garverp/gnuradio/tree/msg_file_sink>

PWG
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