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Net-uart not working on contiki cc1310 node

I am testing the net-uart in contiki.

 

The system setup is as follow:

Contiki node: SRF06EB+CC1310EM running cc26xx-web-demo

Border router: SRF06EB+CC1310EM +BBB with running 6lbr+wrapsix

ipv6 router with ipv4: 192.168.16.1 and ipv6: bbbb::109

PC’s ipv6: bbbb::a96a:999e:b8f7:a664

PC’s ipv4: 192.168.16.11

 

With this setup the IBM Quickstart is working perfectly.

 

Now for net uart testing, I got no result so far:

Net-uart config:

remote ipv6: 0064:ff96:0000:0000:0000:0000:c0a8:100b

remote port: 55777

 

PC usb connected to the contiki node, and the back channel of UART is COM1, with 15200/8/N/1.

 

On PC, I run a serial test software which I send characters out into COM1. Meanwhile on my PC I run an UDP listener software Sokit, setting the UDP server listening port at 55777.

 

I suppose the contiki node receive these serial characters, then the net-uart should send UDP packet at port 55777. Meanwhile on my PC I should see UDP packet receiving in Sokit. But so far I have not succeeded.

 

I have also tried to put the PC’s IPV6 address to the net-uart config, the result is also not successful.

 

Anyone can give me clues what is problem?