The Topology:
PC---Ethernet cable---CR202------wifi-----IR305
CR202 :
WAN IP: 10.5.59.119
LAN IP: 192.168.2.1
Set up WiFi AP.

- Make sure enable the SSH, local access and remote access.

IR305:
WAN IP: 192.168.2.93
LAN IP: 192.168.3.1

- Make sure enable the SSH, local access and remote access.

The verifying process:
- ssh to enter the CR202 backend.

- make sure the end device is connected, PING to test. Then use the command, ssh adm@end device IP, then you could access the end device's backend.