Hi Norbert,
Just to be sure I understood correctly what you wrote regarding network
interface: Do you mean it is impossible to discover the network
interface IP address from the image? It is this IP the teacher Dr. Geo
server needs to broadcast over UDP.
Hilaire
Le 08/05/2018 à 16:22, Henrik Sperre Johansen a écrit :
mDNS and SSDP are pretty much interchangeable, implementation wise;)
The main problem; most computers these days come with multiple networking
interfaces, and are usually connected to separate subnets.
So when you connect a socket to the broadcast address, you have no idea
which interface it will actually send the request over, and whether you can
communicate with other entities is sort if hit or miss.
Pharos netresolver is blissfully unaware/unable to tell you which interfaces
are available,
most of the work in the SSDP implementation went into trying to detect all
the different ones (impossible without the added networking prims, and still
unreliable whether it will find the correct ones with...), and bind:'ing a
socket to each specifically.
IIRC, the default server/client instantiation exemplified in class comments
now simply binds to 0:0:0:0 and hopes the default interface is what you
wanted, SSDPServer>>onAllInterfacesOfferServiceType:atLocation: runs
through the more extensive setup.
Cheers,
Henry
P.S. In second place; a listener loop capable of error handling a spotty
wifi connection/machine sleep cycles...
--
Dr. Geo
http://drgeo.eu
