Hi Nordic team,
Experimenting with nRF NCS v1.5.0, Openthread CoAP.
When the client send a message to server, CONFIG_OPENTHREAD_MTD_SED is enabled, I reduced the poll period to 5 seconds, and I can see the SED node checking in every 5s (Data request).
When I send a multicast message from CoAP clientto ff03::1, the MTD in SED does not receive the message. when not in SED, it receives the message as expected.
From the OT spec it seems like the router should buffer messages sent when SED was sleeping, and forward to it when it wakes up, i.e. when "Data Request" happens.
Did I misinterpret the spec? or is there something else going on?
Here's the wireshark capture of packets sent, node MAC ending in :cd96 is the client sending the light request. 0x4c01 is checking in with the route 0x4c00 and receives ACK back but no further data is forwarded to it. I attached the wireshark log as well.
OT_CoAP_Client_Server_SED_deosnt_rx_data.pcapng
2nd question is about otThreadSetLinkMode(), it return 7 sometimes, which prints "Failed to set MLE link mode configuration" i.e. E2BIG 7 /* Arg list too long */.
Since I don't have access to source, (or do i?) can you please explain why this happens?
Arguments are simply 2 as per sample function
otThreadSetLinkMode(context->instance, mode); mode was retrieved earlier otThreadGetLinkMode().
I am having a hard time replicating this issue, but when it happened a reset didn't fix it, i had to erase the chip and reporgam (as suggested in another post)
seems like Mode input argument has changed from 4 members (ncs 1.3.x) to 3 (ncs 1.5.x) ... hmm perhaps that's the issue?
in modules/lib/openthread/include/openthread/thread.h i don't have "secureDataRequests" under mode struct:
typedef struct otLinkModeConfig
{
bool mRxOnWhenIdle : 1; ///< 1, if the sender has its receiver on when not transmitting. 0, otherwise.
bool mDeviceType : 1; ///< 1, if the sender is an FTD. 0, otherwise.
bool mNetworkData : 1; ///< 1, if the sender requires the full Network Data. 0, otherwise.
} otLinkModeConfig;
3rd question:
I need CoAP Server and Client both in one node, since each nRF52840 in our architecture could be an initiator of a command to another resource, and simultaneously it has resources itself.
Therefore i needed to combine samples of OpenThread/coap client and coap server, which as I understand use different underlying coap implementations, Zephyr coap vs. OT coap.
Seems to work fine other than the 2 issue above, but perhaps this is the cause of the issue #1? Is nordic going to port over the OT Coap Server sample to use the recommended Zephyr Coap library soon?
Thanks,
Farhang
