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botletics / SIM7000-LTE-Shield

Botletics SIM7000 LTE CAT-M1/NB-IoT Shield for Arduino
https://www.botletics.com/products/sim7000-shield
GNU General Public License v3.0
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Failing to read SMS messages #107

Open pilant opened 5 years ago

pilant commented 5 years ago

I've been using this shield for a couple of weeks (mostly) without any problems.

Three times, to date, I have seen a state arise where the readSMS() method fails, even though there are messages to read (the getNumSMS() method returns a non-zero positive number). Nothing seems to clear this state; removing the LiPo battery, Arduino Uno USB cable, etc.

So far, the only thing I have found to clear this state is to clear all SMS messages (AT+CMGD=0,4).

BTW, this has been verified using the LTE_Demo code as well as my own.

Any insights?

Thanks in advance.

- Mark

botletics commented 5 years ago

I haven't had this problem before. What firmware version do you have? Sounds like a firmware glitch or something.

pilant commented 5 years ago

The results of an AT+CGMR are: Revision:1351B03SIM7000A

The SIMCom Library is V1.0.0, which I downloaded June 12, 2019; so it is pretty recent.

- Mark

botletics commented 5 years ago

Have you tried upgrading to 1351B04SIM7000A? Please see this wiki page for instructions.

pilant commented 5 years ago

I can give it a try. Although, since I was not able to reliably reproduce the problem, I don't know of a clear way to know if the problem has been fixed.

botletics commented 5 years ago

There's a possibility that it is a SIM card issue as well, where it glitches out somehow. Like you said, it's hard to say.