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I’m near desperate to solve this.
I’m trying to replace SIM800L modules with SIM7670NA(or SIM7670G) before 2/3G fully stops on T-Mo.
So in months of testing SIM76XX modules(core boards), something happens after 4-6 days of being connected(on T-Mo). I have the APN set and the UART timeout of the SIM7670NA disabled. I have tried sending the AT command every 4 hours, 8 hours, with the same results. There is no CMS Error number given.
There is very little intel on the web about “+CMS ERROR: network timeout”. Once these show up, SMS message take 15-20 minutes to deliver to the module, and daily SMS auto-test messages fail to send, or are delayed hours. This was never problem using SIM800L modules, they just worked reliably. The modules I’m using are T-Mobile certified. mobile phones don’t seem to have this problem.
Should the module be power-cycled every couple days?
Any advice greatly appreciated.
We’re currently testing a SIM7670NA module in the first link (not AND). We have communicated with suppliers, (even the US sales rep for SimCom) more than a few times explaining that we were replacing SIM800L modules in agricultural systems using SMS and they have never mentioned SMS problems. Our tests seem to be doing MUCH better than the review you found. It sites horrible immediate errors unlike I have never seen. I will setup a SIM7670NA from AND Technologies and see if there is a difference. AND is very good to communicate with, and would probably help diagnose issues(to some extent). There are so many more factors involved with sending SMS with 4G LTE(modules), compared to 2G/3G, like APN, SMS service center address, PDP, etc. I’m definitely not an expert at this, but I understand the 4G modules are using packet data, not the (circuit-switched network) back-end as were the 2G devices.
I was feeling like the module needs to be reset or power-cycled on a regular basis, or requires a configuration I’m unaware of. I’ve never found a class, webinar, website, or a book about designing products using 4G LTE modules. While the manufacturers have little support.
Unfortunately this is not a product we sell at DigiKey. If there are performance issues the Manufacturer of the parts has to help. Otherwise the place that sold them. Right now companies are coming back from 2 weeks off for the holidays . This could explain the lack of communication. I would say you need to wait for their response. Others do watch the forum so maybe someone might be able to offer a solution.
