Example of wpasupplicant & dhcpcd service file for dinit.

dhcpcd

# dhcpcd service

type       = process
command    = /usr/bin/dhcpcd -B -M -j /var/log/dhcpcd-service.log wlp3s0
before     = network.target
depends-on = pre-network.target
restart    = true
logfile    = /var/log/dhcpcd.log

wpasupplicant

# wpasupplicant service

type            = process
command         = /sbin/wpa_supplicant -B -i wlp3s0 -c /etc/wpa_supplicant/wpa_supplicant.conf 
before          = network.target
depends-on      = pre-network.target
restart         = true
restart-delay   = 3
smooth-recovery = true

There is error 255, will inspect further.