Dear customer, please check my profile, we have experience in IoT by GSM, we can make the design according to your needs and make important contributions due to our experience, thus saving time and money, we are in the ability to expand the scope of the project by offering you the code of the microcontroller and the delivery of the prototypes to be subjected to tests. With our experience we can suggest components that work perfectly at a lower cost, designs that are easy to implement saving money in the manufacturing with functionalities in the code that will make the difference in your product. such as log of events, battery backup, configuration of the sms, easy way of administration of users, historical of events and user administrative. Please we would like to be part of your project and to dump all our experience in your product.