Implement functionality to omit length delimiter

[RicardoMonteiroSimoes]

I'd like to put this idea up for discussion. It would be a basic parameter for most functions, that defaults to true as to not break existing code. Supplying a false value to it would omit the length delimiter.

Please correct me if I am wrong, but considering the background application runs on TCP you don't need to add said prefix to the message, as TCP handles fragmentation and rebuilding of fragmented packets just fine.