Are these routers able to accept SMS messages? If so, which programming language is the software stack coded? Lua?
Which router are you referring to?
Example: the MP70 is capable of sending and receiving SMS messages.
Please refer to the SMS section on page 269 of the following document: https://source.sierrawireless.com/resources/airlink/software_reference_docs/airlink-mp-series---configuration-guide/#sthash.JkdW4JSZ.dpbs
Please also refer to the ALEOS Application Framework at the following link: https://source.sierrawireless.com/resources/airlink/aleos_af/aleos_af_home/#sthash.MXx3XbBo.EDUhOfM8.dpbs