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  • Case ID: 315569
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Unable to send to a specific multicast address when sending UDP messages in OpenThread CLI sample

Yuma

Hello,

I flashed an Thread CLI sample for nRF52840-DK and checking its operation. (nRF Connect SDK version is v2.3.0)
I use the "ot udp send" command to check the sending of UDP messages, but no logs were displayed in Sniffer even if I configured to send to a specific multicast address.
When the multicast address was FF02::1, the log was displayed in Sniffer, but when it was FF03::1 or FF04::3:0, it was not displayed in the log.
Although it was not mentioned in the README, am I correct in my understanding that the "ot udp send" command can only successfully send to certain authorized multicast addresses?

Best regards,

Yuma

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  • 0

    Hi Yuma,

    I tested this on my side and the UDP messages showed up in the sniffer log when sending to FF03::1 and FF04::3:0. The message sent to the mesh-local address, FF03::1, was printed on the receiving node as well.

    Can you share all the CLI commands you are using when testing?
    Do you have any filters in Wireshark?

    Best regards,
    Marte

  • 0 in reply to Marte Myrvold

    Hi Marte,

    I send each command log in below.

    [Board 1]

    *** Booting Zephyr OS build v3.2.99-ncs2 ***


uart:~$ ot udp open
Done
uart:~$ ot udp linksecurity disable
Done
uart:~$ ot udp bind :: 2378
Done
uart:~$ ot ifconfig up
Done
uart:~$ ot ipmaddr
ff02:0:0:0:0:0:0:1
ff03:0:0:0:0:0:0:1
ff03:0:0:0:0:0:0:fc
Done
uart:~$ ot ipmaddr add ff04::3:0
Done
uart:~$ ot ipmaddr
ff04:0:0:0:0:0:3:0
ff02:0:0:0:0:0:0:1
ff03:0:0:0:0:0:0:1
ff03:0:0:0:0:0:0:fc
Done
uart:~$ ot udp send ff02::1 2378 hello
Done
5 bytes from fe80:0:0:0:48e2:958b:cb7f:4622 2378 68656c6c6f
uart:~$ ot udp send ff04::3:0 2378 hello
Done
uart:~$

    [Board 2]

    *** Booting Zephyr OS build v3.2.99-ncs2 ***


uart:~$ ot udp open
Done
uart:~$ ot udp linksecurity disable
Done
uart:~$ ot udp bind :: 2378
Done
uart:~$ ot ifconfig up
Done
uart:~$ ot ipmaddr
ff02:0:0:0:0:0:0:1
ff03:0:0:0:0:0:0:1
ff03:0:0:0:0:0:0:fc
Done
uart:~$ ot ipmaddr add ff04::3:0
Done
uart:~$ ot ipmaddr
ff04:0:0:0:0:0:3:0
ff02:0:0:0:0:0:0:1
ff03:0:0:0:0:0:0:1
ff03:0:0:0:0:0:0:fc
Done
5 bytes from fe80:0:0:0:94e4:9983:d574:bf36 2378 68656c6c6f
uart:~$ ot udp send ff02::1 2378 hello
Done
uart:~$ ot udp send ff04::3:0 2378 hello
Done
uart:~$

    Each board sended UDP message to FF04::3:0, but the message was not received another one.
    At the time, on wireshark, this messages was not show.
    (When the board sent UDP message to FF02::1, the sniffer log showed on wireshark.)

    I don't have any filters in wireshark.

    Best regards,

    Yuma

  • 0 in reply to Yuma

    Hi Yuma,

    You need to run ot thread start to enable the Thread protocol and attach to a Thread network.

    Best regards,
    Marte

  • 0 in reply to Marte Myrvold

    Hi Marte,

    Thank you for your advice.

    I attached to a Thread network and tried again.
    Then, the sniffer log was displayed in Wireshark, but the reception log was not displayed on the other device.

    [Commissioner]

    *** Booting Zephyr OS build v3.2.99-ncs2 ***


uart:~$ ot thread stop
Done
uart:~$ ot dataset init new
Done
uart:~$ ot dataset channel 11
Done
uart:~$ ot dataset panid 0x1234
Done
uart:~$ ot dataset commit active
Done
uart:~$ ot ifconfig up
Done
uart:~$ ot thread start
Done
uart:~$ ot dataset
Active Timestamp: 1
Channel: 11
Channel Mask: 0x07fff800
Ext PAN ID: 9d94726b558c1095
Mesh Local Prefix: fdc5:ee19:dc7d:f8e1::/64
Network Key: 3cf63d4ddb6a8a4c22c151a4a0b10243
Network Name: OpenThread-f526
PAN ID: 0x1234
PSKc: 0429203bdbd9577fe2c018e32900e7fd
Security Policy: 672 onrc
Done
uart:~$ ot commissioner start
Commissioner: petitioning
Done
Commissioner: active
uart:~$ ot commissioner joiner add f4ce364117e9f1a4 N0RD1C
Done
Commissioner: Joiner start 237c8fef269a5885
Commissioner: Joiner connect 237c8fef269a5885
Commissioner: Joiner finalize 237c8fef269a5885
Commissioner: Joiner end 237c8fef269a5885
uart:~$ ot commissioner stop
Commissioner: disabled
Done
uart:~$ ot udp open
Done
uart:~$ ot udp bind :: 2378
Done
uart:~$ ot udp linksecurity disable
Done
uart:~$ ot ipmaddr
ff33:40:fdc5:ee19:dc7d:f8e1:0:1
ff32:40:fdc5:ee19:dc7d:f8e1:0:1
ff02:0:0:0:0:0:0:2
ff03:0:0:0:0:0:0:2
ff02:0:0:0:0:0:0:1
ff03:0:0:0:0:0:0:1
ff03:0:0:0:0:0:0:fc
Done
uart:~$ ot ipmaddr add ff04::3:0
Done
uart:~$ ot udp send ff04::3:0 2378 hello
Done
uart:~$

    [Joiner]

    *** Booting Zephyr OS build v3.2.99-ncs2 ***


uart:~$ ot thread stop
Done
uart:~$ ot dataset channel 11
Done
uart:~$ ot panid 0x1234
Done
uart:~$ ot ifconfig up
Done
uart:~$ ot joiner start N0RD1C
Done
Join success
uart:~$ ot thread start
Done
uart:~$ ot udp open
Done
uart:~$ ot udp bind :: 2378
Done
uart:~$ ot udp linksecurity disable
Done
uart:~$ ot ipmaddr add ff04::3:0
Done
uart:~$ ot ipmaddr
ff04:0:0:0:0:0:3:0
ff33:40:fdc5:ee19:dc7d:f8e1:0:1
ff32:40:fdc5:ee19:dc7d:f8e1:0:1
ff02:0:0:0:0:0:0:2
ff03:0:0:0:0:0:0:2
ff02:0:0:0:0:0:0:1
ff03:0:0:0:0:0:0:1
ff03:0:0:0:0:0:0:fc
Done
uart:~$ ot udp send ff04::3:0 2378 hello
Done
uart:~$


    Regarding the issue of UDP message reception logs not being displayed, we are currently inquiring through the following ticket, but we are facing an issue where the reception logs will not be displayed unless the thread protocol is disabled.

    https://devzone.nordicsemi.com/f/nordic-q-a/103553/unable-to-receive-udp-messages-when-thread-is-active

    Best regards,

    Yuma

  • 0 in reply to Yuma

    Hi Yuma,

    I will look into the issue about the UDP message not being displayed.

    Best regards,
    Marte

  • 0 in reply to Marte Myrvold

    Hi Yuma,

    Maria will handle the UDP messages not being displayed issue in your other ticket.

    Best regards,
    Marte

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