正确输出

/etc/udhcpc # udhcpc -i wlan0
udhcpc: started, v1.31.1
udhcpc: sending discover
udhcpc: sending select for 192.168.0.57
udhcpc: lease of 192.168.0.57 obtained, lease time 6151
deleting routers
route: SIOCDELRT: No such process
adding dns 192.168.0.1

错误输出

/opt/ko # uchcpc -i wlan0
-sh: uchcpc: not found
/opt/ko # udhcpc -i wlan0
udhcpc: started, v1.31.1
udhcpc: sending discover
udhcpc: sending select for 192.168.0.57
udhcpc: lease of 192.168.0.57 obtained, lease time 6765

获取不到IP原因：配置文件缺失

配置文件参考busybox

/home/wy/hisi/SS524V100_SDK_V2.0.0.3/open_source/busybox/busybox-1.31.1/examples/udhcp

文件系统的目录以及文件

 /usr/share/udhcpc 目录下文件

/usr/share/udhcpc # ls
default.bound     default.deconfig  default.script

 /etc/udhcpc 目录下文件

/etc/udhcpc # ls
resolv.conf

 resolv.conf 文件内容

# cat resolv.conf 
nameserver 192.168.0.1