Is Hologram getting the short end of the stick??


#1

Hi,

What’s wrong with the system? I received an email that stated investigating reports of lost packages, and I agree from my end. However, it also said it was fixed. I don’t agree. I PING the network to T-Mobile in my area so went and bought a new T-Mobile SIM card, changed the “APN” and BAM, it worked… Any thoughts as to why hologram is having issues? At least more often than a SIM using the same network…


Hologram SIM Timeout for UDP (used on Particle hardware)
#2

Hi, we’re not seeing any outages on the network right now and our own pingers are not detecting any packet loss. Can you provide more information about the problem that you’re seeing?


#3

I’ll get this, but I’m using AT commands and receiving an error at a command I don’t receive otherwise using the same network.


#4

AT+SAPBR=3,1,“APN”,“hologram”

OK

AT+SAPBR=1,1

ERROR

AT+SAPBR=0,1

ERROR

Bad response, Code: -1

Should I show you a successful attempt using T-Mobile SIM?


#5

Hi, @Contemporary_Mgmt,

What are the outputs of the following commands?

AT+CREG?
AT+CGREG?
AT+CSQ
AT+COPS=?

Thanks,
PFW


#6

Hi, No problem.
OK
AT+COPS=?
+CREG: 0,5

OK

+CGREG: 0,5

OK

+CSQ: 8,0

OK


#7

You do seem to be connected to the tower properly. What’s the result of AT+COPS??


#8

Doesnt +CREG: 0,5 mean:

  • <Mode> 0 = disable network registration unsolicited result code
  • <Status> 5 = registered, roaming

The AT command manuals I have looked at (SimCOM, U-Blox, Telit) list the +CREG? resonse as:
+CREG: <mode>,<stat>

This means Contemporary’s device is successfully connected right?

EDIT: Just for another datapoint, I have 21 devices on T-Mobile 2G (SIM800H module) with Hologram simcards in 9 states that are successfully sending messages although my message rate is only once every 2 hours so not a lot of data. But I don’t think there is a service issue between T-Mobile and Hologram.


#9

Thanks, @AndrewGifft. I updated my post.

I was using the M2M Support article as a reference, which appears to be incorrect in this case.

SIM900 manual is correct: https://www.espruino.com/datasheets/SIM900_AT.pdf


#10

CSQ of 8 is very low. Maybe just not getting a good signal to the tower?


#11

Thanks, I thought so. I can’t seem to figure out why my service is somewhat better using the other card when it’s supposed to be on the same network though.


#12

Thanks, perhaps… But hasn’t been an issue otherwise.


#13

Are you using tmobile in The Netherlands?
There I see a huge differency in packet transfer (loss) between tmobile and others like kpn and vodafone.
(tmobile is the worst)


#14

My apologies, I’m in Missouri in the United States. I’m Using T-mobile now and it’s working great… I Don’t understand why Hologram is not working as well…


#15

Hi, Thanks, but I don’t agree. At least in my area.


closed #16

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