Pi locks up when trying to reset the R410 Modem

#1

I’ve noticed an issue with my Pi zero and hologram R410M nova. I’ve been having good success with cellular connectivity running the hologram network connect command, occasionally the connection fails so i ran a hologram modem reset command to see if that will help. I see both lights turn off on the nova and back on again but my pi completely locks up. I can’t SSH into it, the keyboard, mouse and display completely freeze. I’ve left it for a few hours and end up having to give it a hard shutdown. I’ve checked some AT commands and it does the exact same thing with AT+CFUN=0, AT+CFUN=1 and AT+CFUN=15

I’ve checked my /var/log/messages, /var/log/syslog and /var/log/kern.log and none of them log anything from these lockup events. I’m not sure how to troubleshoot this issue.

#2

Do you have a good power supply for the RPI? The Nova could draw large (Id say up to 1/2 amp, but probably less) power during power cycle and after reboot. Id make sure you have a 2A supply. Only thing I can think of at this time. Really nothing the Nova does should completely kill the RPI, unless you get a brownout.

#3

Thank you, I had a good power supply but it turned out to be the cable, some are too small of wire gauge i guess. On another note i have written some code to reset the modem if the hologram network connect command fails to connect twice and it seems to work so far.

#4

Hi, are you performing the reset using Hologram tools, or in your own way?

-Matt