@whale-av Thank You for the tipp. But I need communication on the signal level. This is much more complex, as send small messages to pd. The problem is, that on the signal level the data must be time accurate. I will try now to understand the netreceive~and netsend~ source code, and hope I can write a function which can work in the outer pd world.

@whale-av The App is called Sonifyer and I am the developer.
With the connection to PD, there would be much more possibilities of sonification.
In Sonifyer there is a AURenderCallback function. Now I try to send the signals of each channel to pd.
I need a netreceive and send function, which works just like the pd netreceive~ /netsend~function.

Hello
I search c or c++ or objective-c code, to send and receive signals from my application from/to Pd. In Pd I will send and receive signals with netreceive~ and netsend~.
I know, I could do it with libpd but I think this is overload, only to send and receive the signal from and to Pd to my application.
Regards, Oliver