I'm following the SLA to run the Wi-SUN examples, after successfully flashed the ns_node and ns_coap node images, I ran the spinel-sli.py script to start the network. However, after running the wisunstack start command, the wisunstack command still returned "stop" for the network status, and the returned status for routerstate command was 1.
I waited for a long time and the router node did not have any UART print message updated, it seemed the wisunstack start did not work. What did I miss?

BR,
Shuyang