How can the process priority be set?

How can I set the priority of the process under Linux? The nice command doesn’t seem to be available and obviously can’t be installed via opkg.

How about using busybox’ renice command?

root@colibri-vf:~# renice --help
BusyBox v1.24.1 (2018-12-17 16:51:25 UTC) multi-call binary.

Usage: renice {{-n INCREMENT} | PRIORITY} [[-p | -g | -u] ID...]