The article describes the Water Level Monitor project, in which the possibility of data transfer via the worldwide IoT IoT network was implemented. It allows the transfer of small volumes of data. The article mentions a modem for the Sigfox network, its availability at Czech retailers, the content of the message - payload, which is sent. Custom Callback settings in the Sigfox backend, which implements the final HTTP / HTTPS POST request with data storage in its own MySQL database. The system is suitable for ultra low power applications, especially with the ESP32 microcontroller for battery operation.
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