In-house production of electric trucks with modular assembly that allows for bespoke construction for each client. We have developed a companion app for use on Android for the Charge.Auto project. The app is used by truck drivers to check the vehicle's systems, and for submitting reports about technical performance tests at the start and end of each working day. The automated system for data retrieval from monitors allows the driver to stay abreast of potential problems with the vehicle. The companion app has an important feature, which is a smart system for automatic authorization of the app and the vehicle by means of an exchange of encrypted keys with no human input. When working normally, the app tracks the status of orders and the route, thus making it operationally possible to update on any changes in orders, either from the system or the driver.