Data transmission question between coap client and coap sever

[caidehen]

I now have five nrf52833dk_nrf52833 development boards burn the thread client  procedure，and now I want these five development boards  send data  to another nrf52833dk_nrf52833 development board which is burnned the thread sever procedure , How do I change the ip? how do I pair the network? how do I modify the demo program ?

• The following images show the program names burned to different development boards

[caidehen]

Thank you very much for your profound and patient answer. Thank you very much! I want to follow you, but I accidentally went to your home page and clicked this button. 

My English was poor. I was very sorry when I knew what he meant  I'm really sorry. If you need me to help you appeal, I will do my best to assist you，Best wishes to you！

[Marte Myrvold]

Hi,

No need to worry. You are not the first to report someone or someone's reply as abusive by accident, and one report will not affect anything alone

I am glad to have been of help!

Best regards,
Marte

[caidehen]

hello  Marte 

otExtAddress extAddress = {{ 0xde, 0xad, 0x00, 0xbe, 0xef, 0x00, 0xca, 0xfe }};

• What are the requirements for this address data? Or was it just random?

• How can link-local address be used in a link?
• Through monitoring, I found that ff03: : 01 in the following figure is used in multicast, and the two fdda addresses in the following figure are used in unicast, while the address of fe80 is never used. The link-local address you mentioned. Which address does it start with?

[Marte Myrvold]

Hi,

caidehen said:

What are the requirements for this address data? Or was it just random?

The address I used was random, but it must be 8 bytes. You can find the API for the data type here at https://openthread.io/reference/struct/ot-ext-address.

caidehen said:

How can link-local address be used in a link?

Can you specify what you mean by this?

caidehen said:

Through monitoring, I found that ff03: : 01 in the following figure is used in multicast, and the two fdda addresses in the following figure are used in unicast, while the address of fe80 is never used. The link-local address you mentioned. Which address does it start with?

The link-local address is the one that starts with fe80. As found in IPv6 Addressing, link-local addresses always have prefixes of fe80::/16.

Best regards,
Marte