Has anyone else experienced the SARA R410 locking up under low signal conditions when connected to AT&T? Usually when I see it happen, it goes like this:
Open a TCP socket and send some data
Close the socket, modem replies “OK”
The next time I am ready to send some data, the modem is totally unresponsive to the AT terminal.
I am using all of the recommended response timeouts listed in the AT Manual and all PSM (power save mode) is disabled.
The only way to recover is a hard reset using the reset pin on the modem.
I have been battling this for a while. Using a higher gain antenna seemed to help, but I am still dealing with this. Resetting the modem within the program is no problem, I am just worried about long term damage to the modem. Sometimes 10+ resets are required per day.
fail in the same way as the SARA-R4 modems have been failing on AT&T.
(e.g. firmware lockup with modem reenumerating on the USB bus as
Product: QHSUSB__BULK
)
I suspect the root of the problem is with Qualcomm, which would explain why we’re not seeing a solution from uBlox and Hologram.
Seems like AT&T might be interested in getting this fixed, as it seems to impact only their towers.
Interesting… Have you seen this behavior on any other network? AT&T cat m1 is the only network available to me.
I can confirm the issue is present with a cat m1 sim directly from AT&T marketplace as well as the hologram sim.
As a work-around, I have been using the strategy I described in post #3. It seems like the less time the modem is attached to the network, the less chance there is of this problem.
genosensor, zbelding, I too am having the Nova fail on ATT after an indeterminate amount of time. I have a Raspberry Pi 3+ that will work great for anywhere from 3 hours to more than 3 days but the error is always the same, the system seems to lose communications with the modem (lock up?) and the solution that I have found is either a graceful power down of the Pi including pulling the power supply or physically pulling the Nova from the USB port (very hard power down!) and re-inserting it. I have not seen any of the Hologram support people answering any of the forums for the last month so we might be on our own.
I too had the ATT lockup problem back in March and just gave up. Any chance you could put the firmware and update tool on Dropbox or google drive and share a link?
Just get in touch with ublox, they will give you what you need. My device does not have the Modem USB available, so I updated via AT terminal and x-modem.
