Use the new FIFO implementation for DDCI

[catalinii]

• Adds a new FIFO implementation
• Extend it for storing the data read from the DDCI device

[lars18th]

Hi @catalinii ,

This patch seems interesting. You have the idea to update the satipc input module with this new FIFO implementation? And what about the processing internal buffer?

[catalinii]

I was thinking about using fifo for the satipc module (for sending the messages instead of the hash table), but I think a better option is to refactor and prevent the satipc module from buffering responses. This would be better because of a message is buffered any update to the list of pids for example, requires a new message. If there is no buffering the satipc module can just share it's current state rather than an older state. I plan next to replace the socket buffering with FIFO, as based on current consumption it uses 2x-4x more memory that usable.