Common Libraries

The NMOS specifications make extensive use of pre-existing technologies which are defined in other documents such as IETF RFCs. In most cases it should not be necessary to implement these technologies from the ground up. The following pointers are provided to some useful libraries which already implement commonly used technologies in a variety of programming languages.

HTTP API Frameworks

Library	Language
Flask	Python

HTTP Clients

Library	Language
Requests	Python

DNS Service Discovery (DNS-SD)

Library	Language	Multicast Support	Unicast Support	Caveats
pybonjour	Python	Y	Y*	Supports Unicast queries on Windows and Mac but not Linux
python-zeroconf	Python	Y	N	Newer versions cannot advertise the over-long _nmos-registration._tcp name without modification (see #34 and zeroconf-monkey).
avahi-python	Python	Y	Y*	Unicast support requires re-querying of the Avahi daemon periodically. There can be issues closing sockets when doing this resulting in file descriptor leaks.
dnspython	Python	N	Y
avahi-...	C	Y	?
mDNSResponder	C	Y	Y*	Cannot handle the _nmos-registration._tcp name when using unicast DNS (see #34)