Home › Forums › Mayfly Data Logger › XBee and Hologram LTE: issues connecting to internet › Reply To: XBee and Hologram LTE: issues connecting to internet
2020-12-22 at 4:23 PM #14960
- If the SIM provider says you don’t have to do anything to activate the SIM, I’d trust them.
- Yes, the “AS” command in the first run sketch does that. (line ~147)
- If you’re using an XBee3 LTE-M it *only* supports LTE-M and LTE NB-IoT. Since your provider doesn’t use NB-IoT, LTE-M will be the only possibility. That first-run program you’re using sets the bee to use LTE-M preferentially in line 121, which is what you want.
- This might be your issue. Yes, the module can use all of those bands, but you would commonly set it up to use a specific carrier profile that will optimize searching to only the bands that carrier uses. In the example sketch (line 115), the carrier profile is set to 2/AT&T. Most of AT&T’s traffic is on bands 2, 4, and 12 (https://www.phonearena.com/news/Cheat-sheet-which-4G-LTE-bands-do-AT-T-Verizon-T-Mobile-and-Sprint-use-in-the-USA_id77933). So if you’re setting your module to AT&T, it will not attempt to use band 3 or band 28. I think you would want to select “1” as your carrier profile here, which will set the module for “SIM ICCID/IMSI select.” *Hopefully* your SIM and the module will be friendly enough with each other that the module will then switch its mode to that for your SIM. This doesn’t always work, though. I know with a Hologram SIMs in the USA the module will attempt to switch to 100/Standard Europe based on the SIM ICCID, which won’t work. But with a T-Mobile SIM the “SIM ICCID/IMSI select” setting immediately correctly matched to the 5/T-Mobile profile and the connection worked right away. If just switching the carrier profile to 1 doesn’t work, there are commands to manually try and force the bands. Start with the profile, though.
- Well, I generally think getting the development board is a good idea if you want to ever do much with the XBee (like test multiple boards or update firmware) but it shouldn’t be strictly needed.