Reverse engineering and creation of a temperature monitoring app

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Developing an app for a client to monitor temperatures for medical purposes
A client of mine has a product in the form of a sensor that monitors the temperature of medical critical infrastructures, such as medicine refrigerators or organ transports. For the configuration, analysis and alerting of the sensor, he had licensed an app from another provider. The app was actually for another product, but the other software company changed the logo and then decided to call it a day. One day, however, the software company became impudent and demanded €50,000 licence fee per year for a product that was not even tailored to my client’s needs.