[hpsdr] Metis/Hermes updates for gnuradio

[Tom McDermott]

The code for Metis/Hermes modules for gnuradio has been updated.

One user (not me) has multiple Hermes, Metis, and Hermes Lite units
on his LAN, and needed a way to select a particular unit when of course
they all respond to an HPSDR discovery request.

A new field "MAC Addr or *" has been added to both the NarrowBand
and WideBand modules to allow specifying an exact MAC address to
talk to, or a wildcard "*" to select the first HPSDR module that responds
to discovery. The default value is "*" which preserves the current
automatic mode where the first HPSDR found on the LAN is used and
automatically started without any user intervention.

The MAC address is used because an IP address could change if your
DHCP server were to be rebooted. The MAC address is permanently
attached to a specific device (in theory). Note that MAC address is a
string, the documentation tab for the hermesNB and hermesWB
modules have examples of the exact string format required.

>From github:

https://github.com/Tom-McDermott/gr-hpsdr


>From TAPR SVN:

http://svn.tapr.org/repos_sdr_hpsdr/trunk/N5EG/GRC3.7/gr-hpsdr/


-- Tom, N5EG
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