Trivial to fix to let it work with busybox ash for embedded.
Created attachment 112686 [details, diff] 00-no-bash.patch patch for dhclient-script
Created attachment 112688 [details, diff] 10-bash-subst.patch fixes init.d script
Created attachment 112708 [details, diff] 10-unbash.patch fixes: if [[ expr == *" ... "* ]] ; ... replaces [[ ]] with [ ]
Fixed, thanks