Thingy:91 doesn't connect to nRF Cloud from China

RE: Thingy:91 doesn't connect to nRF Cloud from China

JONATHAN LL — Mon, 10 Aug 2020 07:46:52 GMT

Hi amessner,

Assuming that the first attempt in Canada worked then the certificate is valid.

So for the SIM cards

[quote user=""]I tried two different SIM cards, one is the iBasis SIM the device came with, the other one is a Hologram SIM.[/quote]

It does not look like the IBasis SIM supports NB-IoT or LTE-M in China at the moment, here is a link(IBasis coverage) for the IoT network coverages from IBasis.
The same goes for Hologram SIM provider, this link(Hologram coverage) indicates that they do not support NB-IoT in China.

Here is a list of providers that should support NB-IoT in China, according to the GSMA website (https://www.gsma.com/iot/deployment-map/#CN):

China Mobile
China Unicom - This one specifically states Shenzhen
China Telecom

Regards,
Jonathan

RE: Thingy:91 doesn't connect to nRF Cloud from China

amessner — Fri, 07 Aug 2020 14:49:23 GMT

Hi Jonathan,

No I haven't, but the device connected successfully to the nRF Cloud two weeks ago from here in Canada. I assume the certificate is valid otherwise it wouldn't have been able to connect from here in Canada, correct?

I was running the same modem firmware and application. Since we don't have NB-IoT in North America the device couldn't connect to LTE initially, but then switched to fallback mode (LTE-M1) and connected immediately to LTE and the nRF Cloud.

I haven't changed anything to the device, the only difference is that is is now physically located in China (Shenzhen).

Any thoughts?

Thanks

Alex

RE: Thingy:91 doesn't connect to nRF Cloud from China

JONATHAN LL — Fri, 07 Aug 2020 08:45:53 GMT

Hi amessner,

Have you tried to update the nRF Connect for Cloud certificate for your device?
Her is a link: infocenter.nordicsemi.certificate

Regards,
Jonathan