For this issue, here is some information below:
1. If the measurement data is not uploaded successfully through the gateway, it will be stored in the scale first;
2. You can connect the Mi Home/Xiaomi Home APP with the Xiaomi Body Composition Scale S400 and the scale will automatically synchronize the data in the device to the APP;
3. When using the gateway to synchronize data after the initial binding, there will be a situation where the first weighing data is not synchronized due to the network reasons. You can open the Mi Home/Xiaomi Home APP and connect it with the scale, then the data will be synchronized;
4. Due to the design of the gateway, if it powers off, the online status of the gateway will be delayed for 144 minutes before updating to the offline status. During this period, measurement data cannot be uploaded through the gateway.