I started a program throttled using trickle as trickle -d 10 -u 5 program. Now I want to change change the throttling speed to -d 50 -u 40. How can I change it without closing the program ?  tricklectl sounds well but I can't use it. In the manual they says it will be ready soon but I can't see any development for the last 10 years. So I think someone else should have made it. I'm also interested in editing the .c code but I have little knowledge in C . 
How to change speed limit of running trickle instance
linux;bandwidth;qos