Instrument control: TCP how to send command on one port and receive response on another port ?

Hi everybody,

I have been a matlab user for 15 years, but a beginner when it comes to interfacing instruments. I would like to control a TOF camera (TOFcam-660) with the functions offered in the Instrument Control toolbox.

I have already tried many possibilities (pnet.m, client.m, ...) with no success.

I have two questions:

1) the TOFcam-660 camera uses different ports for transmission (50660) and reception (50661) (see figures attached). I couldn't find any example corresponding to this kind of situation. Is it enough to open the two ports as below:

ts = tcpclient('10.0.0.180',50660,"Timeout",10,"ConnectTimeout",15);

tr = tcpclient('10.0.0.180',50661,"Timeout",10,"ConnectTimeout",15);

The netstat command does show that both ports are open:

system('netstat -at | grep 5066');

tcp 0 0 tomothecho:52960 10.0.0.180:50660 ESTABLISHED

tcp 0 0 tomothecho:49836 10.0.0.180:50661 ESTABLISHED

2) my second question is about sending a command payload through port 50660 to ask the camera to send some information. Again, what to do seems more complex than what I find in the examples.

Typically, what to send is something like:

{start marker 4 bytes, payload size 4 bytes, payload, end marker 4 bytes}

With start marker = 0xFFFFAA55 and end marker = 0xFFFF55AA

The content of the payload depends on the type of response desired (typically a command number in uint16 followed by some parameters).

Despite many attempts, I was unable to send this type of information to the camera.

My hope was to use the writebinblock function, after generating a serialized sequence with getByteStreamFromArray:

c37BytePacket = getByteStreamFromArray({0xFFFFAA55,uint32(2),uint16(37),0xFFFF55AA});

writebinblock(ts,c37BytePacket,"uint8")

Does anyone have an idea on how to do this?

Thank you so much,

Dominique.