Cannot offload function, whose code is longer than `1024` bytes

[mateuszkobak]

This issue is connected to two things:

1. Now trying to offload bigger functions results in parsing error at some level of nanopb flow.
2. In many functions buffers have fixed size 16kB, which (as far as I understand) limits the size of the function code to 16kB.

I think this is important to indicate clearly how big an offloaded function can be. For UC3 the function that we offload from device-runtime-py are 17-22kB, which falls into both issues that I mentioned above.

[amfrac]

Current version of our AI-based offloaded functions can be found in this file and there is also an example of executing them using Python version of Device Client with sample values of input parameters. For now, they require data and model files which are also available on this branch, but if it is a problem, we suggest testing on baseline function until we fully integrate with MinIO. Appropriately, the file with function and example.

[mateuszkobak]

Explaining more in details what I found out in terms of the nanopb issue:

device-runtime-c/cognit/nanopb/nano.pb.h

Line 117 in 693b0f7

char fc_code[1025];

As far as I understand, above is the place where "function type" is defined. When I try to make this buffer bigger than 4095 (which is max value that can be written with 12 bits) there is a static assert that gets triggered during compilation: