Unfortunately, I found that the Meraki Cellular Gateway is not capable of sending Event SMS. The SIM card can send SMS, but it is not possible on any interface (HTTP or dedicated TCP port). Do you have information on how to initiate AT commands on the device? In the API library, I only see a provider response (at&t) at the query level. It is possible to request an improvement from you, which could send out error messages via SMS with curl or any API capable app.
Thank you for the information. I'm a little sad because we bought this model precisely because of the network homogeneity. The device will be in a micro data center and its main task would be to send environmental alerts. Now I am re-planning the operation a little, but if it were possible to request such an improvement, it would greatly simplify the operation.