OSCP5 Multicast

RaulF

Hi there!

I'm trying to configure a multicast network with 3 Raspberry pi. The Raspberry are in the same network (I have configured an access point in one of the Raspberry), with IP 172.25.1.1, 172.25.1.2, 172.25.1.3.

If I write

// master.pde  (in raspberry  172.25.1.1)                 
oscP5 = new OscP5(this, "172.25.1.0", 8975);          

// client.pde  (in raspberry  172.25.1.2 and 172.25.1.3)                     
oscP5 = new OscP5(this, 8975);             
theNetAdress = new NetAddress("172.25.1.1", 8975);

It works. In fact, it works incredible well! The sync between the 3 rasp is really good. But, I get the warning - of course - that "172.25.1.0" is not a multicast address. I have tried with 239.0.0.1, etc. and there is no way. It doesn't work.

Any idea?

Thanks!!

gohai

@RaulF I haven't attempted this myself, and my knowledge of "multicast" is rather rudimentary, but: have you attempted to use 172.25.1.255? i.e. the "last" address in the subnet, assuming your netmask is 255.255.255.0 (or /24).

I believe this is called the "broadcast" address, and might do the trick. (Corrections welcome!)

RaulF

Hi gohai,

In fact, it works fine when I use "172.25.1.0". I receive a warning message ("this address is not multicast", but the sync works. The problem is that when I try to use a correct multicast address, as "239.0.0.1" it doesn't sync at all. I have tried several combinations in Master and slave, without success yet.

Thanks! r.

gohai

You might want to post this question in a general category, to reach a larger audience (isn't Raspberry Pi specific as far as I can tell).

RaulF

Thanks gohai.

In fact, I'm almost sure I posted this in Library Questions. maybe I'm wrong.

Anyway, I have configured a OSCP5 "broadcast" connection that works fine too. I will continue exploring how the "multicast" works, but it's not urgent.

Thanks again! r.-