Hi,
I’m trying to connect the Hologram Nova using NB IoT in the US (Bay Area).
I’m able to connect the Internet in case I’m using LTE-M (-> at+URAT=7).
If LTE-M is enabled the module connects right away, with and without using the Hologram SDK.
But when I try to use only NB IoT (-> at+URAT=8) the module doesn’t connect to a network.
ati gives me:
Manufacturer: u-blox
Model: SARA-R410M-02B
Revision: L0.0.00.00.05.06 [Feb 03 2018 13:00:41]
SVN: 02
IMEI: 356726102472800
I’m pretty sure there should be NB IoT Reception in my Area as ‘AT+COPS=?’ returns this list:
+COPS: (3,“311 480”,“311 480”,“311480”,9),(1,“310 260”,“310 260”,“310260”,9),
(1,“AT&T”,“AT&T”,“310410”,9),(0,1,2,3,4),(0,1,2)
and ‘at+csq’ returns
+csq: 14,99
I also tried to connect to AT&T (310410) manually (-> m.ex’at+cops=1,2,310410,9’) but it didn’t work out.
I don’t want to use the hologram SDK, as I need control over PSM and eDRX sittings and only wan’t to use NB-IoT for evaluation of the network.
I also tried to follow the ublox Guide https://www.u-blox.com/sites/default/files/SARA-R4-N4-Application-Development_AppNote_(UBX-18019856).pdf (Section 8.5.1), but it didn’t help me.
In some posts I read that the connection to the network with NB-IoT can take up to an hour. Does anybody have any experience in using only NB-IoT in the US or an Idea what I can try?
Thanks in Advance!
Dominik