RE: Shadow delta CoAP request failing with 4.06 Not Acceptable despite stable setup (nRF9151)

Markku Lehto — Fri, 27 Jun 2025 10:58:55 GMT
Hi Akshay,
We have now corrected the issue and you should not see it appear in your logs anymore. Again, thanks for reporting it.
Best regards,
Markku Lehto
RE: Shadow delta CoAP request failing with 4.06 Not Acceptable despite stable setup (nRF9151)

Akshay — Fri, 27 Jun 2025 10:05:18 GMT
Hi Markku,
Thanks for the update.
warm regards,
RE: Shadow delta CoAP request failing with 4.06 Not Acceptable despite stable setup (nRF9151)

Markku Lehto — Fri, 27 Jun 2025 10:01:18 GMT
Hi Akshay,
thanks for reporting this. It seems that we have an issue and we are currently working on to fix it.
Best regards,
Markku Lehto
RE: Shadow delta CoAP request failing with 4.06 Not Acceptable despite stable setup (nRF9151)

Akshay — Fri, 27 Jun 2025 08:23:32 GMT
This is my configuration
Full log
[00:11:01.281,158] <err> net_coap: Timeout in poll, retrying send
[00:11:01.739,288] <err> nrf_cloud_coap: Unexpected result code: 4.06
[00:11:01.739,318] <err> shadow_support_coap: Failed to request shadow delta: 134
[00:11:11.739,440] <inf> shadow_support_coap: Checking for shadow delta...
[00:11:11.740,936] <err> net_coap: Unexpected ACK or Reset
[00:11:11.740,966] <err> net_coap: Error handling response
[00:11:14.741,699] <err> net_coap: Timeout in poll, retrying send
[00:11:14.764,770] <err> nrf_cloud_coap: Unexpected result code: 4.06
[00:11:14.764,770] <err> shadow_support_coap: Failed to request shadow delta: 134
[00:11:24.764,923] <inf> shadow_support_coap: Checking for shadow delta...
[00:11:24.766,418] <err> net_coap: Unexpected ACK or Reset
[00:11:24.766,448] <err> net_coap: Error handling response
[00:11:27.767,181] <err> net_coap: Timeout in poll, retrying send
[00:11:27.820,220] <err> nrf_cloud_coap: Unexpected result code: 4.06
[00:11:27.820,251] <err> shadow_support_coap: Failed to request shadow delta: 134
[00:11:37.820,404] <inf> shadow_support_coap: Checking for shadow delta...
[00:11:37.821,899] <err> net_coap: Unexpected ACK or Reset
[00:11:37.821,929] <err> net_coap: Error handling response
[00:11:40.322,540] <err> net_coap: Timeout in poll, retrying send
[00:11:40.854,736] <err> nrf_cloud_coap: Unexpected result code: 4.06
[00:11:40.854,736] <err> shadow_support_coap: Failed to request shadow delta: 134
[00:11:50.854,888] <inf> shadow_support_coap: Checking for shadow delta...
[00:11:50.856,384] <err> net_coap: Unexpected ACK or Reset
[00:11:50.856,414] <err> net_coap: Error handling response
[00:11:53.357,025] <err> net_coap: Timeout in poll, retrying send
[00:11:53.966,186] <err> nrf_cloud_coap: Unexpected result code: 4.06
[00:11:53.966,186] <err> shadow_support_coap: Failed to request shadow delta: 134
[00:12:03.966,339] <inf> shadow_support_coap: Checking for shadow delta...
[00:12:03.967,834] <err> net_coap: Unexpected ACK or Reset
[00:12:03.967,864] <err> net_coap: Error handling response
[00:12:06.468,475] <err> net_coap: Timeout in poll, retrying send
[00:12:07.021,667] <err> nrf_cloud_coap: Unexpected result code: 4.06
[00:12:07.021,667] <err> shadow_support_coap: Failed to request shadow delta: 134
[00:12:17.021,820] <inf> shadow_support_coap: Checking for shadow delta...
[00:12:17.023,315] <err> net_coap: Unexpected ACK or Reset
[00:12:17.023,315] <err> net_coap: Error handling response
[00:12:17.767,028] <err> nrf_cloud_coap: Unexpected result code: 4.06
[00:12:17.767,028] <err> shadow_support_coap: Failed to request shadow delta: 134
[00:12:27.767,181] <inf> shadow_support_coap: Checking for shadow delta...
[00:12:30.769,165] <err> net_coap: Timeout in poll, retrying send
[00:12:30.862,457] <err> nrf_cloud_coap: Unexpected result code: 4.06
[00:12:30.862,487] <err> shadow_support_coap: Failed to request shadow delta: 134
[00:12:40.862,609] <inf> shadow_support_coap: Checking for shadow delta...
[00:12:40.864,105] <err> net_coap: Unexpected ACK or Reset
[00:12:40.864,135] <err> net_coap: Error handling response
[00:12:43.364,746] <err> net_coap: Timeout in poll, retrying send
[00:12:43.856,994] <err> nrf_cloud_coap: Unexpected result code: 4.06
[00:12:43.856,994] <err> shadow_support_coap: Failed to request shadow delta: 134
[00:12:53.857,147] <inf> shadow_support_coap: Checking for shadow delta...
[00:12:53.858,642] <err> net_coap: Unexpected ACK or Reset
[00:12:53.858,673] <err> net_coap: Error handling response
[00:12:56.359,283] <err> net_coap: Timeout in poll, retrying send
[00:12:56.783,447] <err> nrf_cloud_coap: Unexpected result code: 4.06
[00:12:56.783,477] <err> shadow_support_coap: Failed to request shadow delta: 134
[00:13:06.783,599] <inf> shadow_support_coap: Checking for shadow delta...
[00:13:06.785,095] <err> net_coap: Unexpected ACK or Reset
[00:13:06.785,125] <err> net_coap: Error handling response
[00:13:09.285,736] <err> net_coap: Timeout in poll, retrying send
[00:13:09.777,923] <err> nrf_cloud_coap: Unexpected result code: 4.06
[00:13:09.777,923] <err> shadow_support_coap: Failed to request shadow delta: 134
[00:13:19.778,076] <inf> shadow_support_coap: Checking for shadow delta...
[00:13:19.779,571] <err> net_coap: Unexpected ACK or Reset
[00:13:19.779,602] <err> net_coap: Error handling response
[00:13:22.704,345] <err> nrf_cloud_coap: Unexpected result code: 4.06
[00:13:22.704,406] <err> shadow_support_coap: Failed to request shadow delta: 134
[00:13:32.704,528] <inf> shadow_support_coap: Checking for shadow delta...
[00:13:35.206,390] <err> net_coap: Timeout in poll, retrying send
[00:13:35.698,852] <err> nrf_cloud_coap: Unexpected result code: 4.06
[00:13:35.698,883] <err> shadow_support_coap: Failed to request shadow delta: 134
[00:13:45.699,005] <inf> shadow_support_coap: Checking for shadow delta...
[00:13:45.700,500] <err> net_coap: Unexpected ACK or Reset
[00:13:45.700,531] <err> net_coap: Error handling response
[00:13:48.201,141] <err> net_coap: Timeout in poll, retrying send
[00:13:48.625,335] <err> nrf_cloud_coap: Unexpected result code: 4.06
[00:13:48.625,335] <err> shadow_support_coap: Failed to request shadow delta: 134
[00:13:58.625,488] <inf> shadow_support_coap: Checking for shadow delta...
[00:13:58.626,983] <err> net_coap: Unexpected ACK or Reset
[00:13:58.627,014] <err> net_coap: Error handling response
[00:14:01.127,624] <err> net_coap: Timeout in poll, retrying send
[00:14:02.130,798] <err> nrf_cloud_coap: Unexpected result code: 4.06
[00:14:02.130,828] <err> shadow_support_coap: Failed to request shadow delta: 134
+CSCON: 0
+CEREG: 5,"C014","0000C090",9,,,"00001010","11000001"
*** Booting MCUboot v2.1.0-dev-daf2946a0f07 ***
*** Using nRF Connect SDK v2.7.0-5cb85570ca43 ***
*** Using Zephyr OS v3.6.99-100befc70c74 ***
I: Starting bootloader
I: Primary image: magic=unset, swap_type=0x1, copy_done=0x3, image_ok=0x3
I: Secondary image: magic=unset, swap_type=0x1, copy_done=0x3, image_ok=0x3
I: Boot source: none
I: Image index: 0, Swap type: none
I: Bootloader chainload address offset: 0x10000
*** Booting nRF Connect SDK v2.7.0-5cb85570ca43 ***
*** Using Zephyr OS v3.6.99-100befc70c74 ***
[00:00:00.251,556] <inf> main: nRF Cloud multi-service sample has started, version: 1.0.0, protocol: CoAP
[00:00:00.251,739] <inf> cloud_connection: Enabling connectivity...
[00:00:00.530,548] <inf> cloud_connection: Setting up nRF Cloud library...
[00:00:00.532,043] <inf> cloud_connection: Waiting for network ready...
+CGEV: EXCE STATUS 0
+CEREG: 2,"C013","0000BD90",9
+CSCON: 1
+CSCON: 0
+CEREG: 2,"C014","0000C092",9
+CSCON: 1
+CGEV: ME PDN ACT 0,1
[00:00:53.371,154] <wrn> nrf_modem_lib_netif: No IPv4 address given by the network
+CNEC_ESM: 51,0
+CEREG: 5,"C014","0000C092",9,,,"00001010","11000001"
%XTIME: "22","52607280521322","00"
+CGEV: IPV6 0
[00:00:53.373,687] <inf> cloud_connection: Network connectivity gained!
[00:00:54.373,809] <inf> cloud_connection: Network is ready
[00:00:54.373,840] <inf> cloud_connection: Connecting to nRF Cloud
[00:00:54.374,450] <inf> cloud_connection: Device ID: nrf-359404230002876
[00:00:55.009,246] <inf> dtls: IMEI:                  359404230002876
[00:00:55.009,277] <inf> dtls: Modem FW version:      mfw_nrf91x1_2.0.1
[00:01:00.015,869] <inf> nrf_cloud_coap_transport: Request authorization with JWT
[00:01:01.183,074] <inf> nrf_cloud_coap_transport: Authorization result_code: 2.01
[00:01:01.183,166] <inf> nrf_cloud_coap_transport: Authorized
[00:01:01.183,563] <inf> nrf_cloud_coap_transport: DTLS CID is active
[00:01:02.442,260] <inf> cloud_connection: Connected to nRF Cloud
[00:01:02.442,413] <inf> shadow_support_coap: Checking for shadow delta...
[00:01:02.443,634] <inf> nrf_cloud_fota_poll: Checking for FOTA job...
[00:01:02.872,222] <err> nrf_cloud_coap: Unexpected result code: 4.06
[00:01:02.872,222] <err> shadow_support_coap: Failed to request shadow delta: 134
[00:01:03.383,209] <inf> nrf_cloud_coap: No pending FOTA job
[00:01:03.383,239] <inf> nrf_cloud_fota_poll: No pending FOTA job
[00:01:03.863,189] <inf> application: Waiting for modem to determine current date and time
[00:01:03.863,250] <inf> application: Current date and time determined
[00:01:12.872,375] <inf> shadow_support_coap: Checking for shadow delta...
+CSCON: 0
+CSCON: 1
[00:01:15.102,661] <err> nrf_cloud_coap: Unexpected result code: 4.06
[00:01:15.102,661] <err> shadow_support_coap: Failed to request shadow delta: 134
[00:01:25.102,813] <inf> shadow_support_coap: Checking for shadow delta...
+CSCON: 0
[00:01:27.604,675] <err> net_coap: Timeout in poll, retrying send
+CSCON: 1
[00:01:28.479,095] <err> nrf_cloud_coap: Unexpected result code: 4.06
[00:01:28.479,125] <err> shadow_support_coap: Failed to request shadow delta: 134
[00:01:38.479,278] <inf> shadow_support_coap: Checking for shadow delta...
+CSCON: 0
+CSCON: 1
[00:01:39.904,541] <err> nrf_cloud_coap: Unexpected result code: 4.06
[00:01:39.904,571] <err> shadow_support_coap: Failed to request shadow delta: 134
[00:01:49.904,724] <inf> shadow_support_coap: Checking for shadow delta...
+CSCON: 0
+CSCON: 1
[00:01:51.454,956] <err> nrf_cloud_coap: Unexpected result code: 4.06
[00:01:51.454,986] <err> shadow_support_coap: Failed to request shadow delta: 134
[00:02:01.455,139] <inf> shadow_support_coap: Checking for shadow delta...
+CSCON: 0
+CSCON: 1
[00:02:02.944,396] <err> nrf_cloud_coap: Unexpected result code: 4.06
[00:02:02.944,396] <err> shadow_support_coap: Failed to request shadow delta: 134
[00:02:12.944,549] <inf> shadow_support_coap: Checking for shadow delta...
+CSCON: 0
+CSCON: 1
[00:02:14.491,821] <err> nrf_cloud_coap: Unexpected result code: 4.06
[00:02:14.491,851] <err> shadow_support_coap: Failed to request shadow delta: 134
[00:02:24.491,973] <inf> shadow_support_coap: Checking for shadow delta...
+CSCON: 0
+CSCON: 1
[00:02:25.985,229] <err> nrf_cloud_coap: Unexpected result code: 4.06
[00:02:25.985,229] <err> shadow_support_coap: Failed to request shadow delta: 134