void sensor_task(void)
{
    size_t iteration = 0;
    while (true) {
        if ( iteration % 2 == 0 ) {
            const float v = get_sensor_value();
            char buf[256];
            snprintf(buf, 256, "{value:%.2f}", v);
            network_send(buf);
        }
        sleep(1);
    }
}
