Separate all data values you want to send over BLE into characteristics and services From our search, we found a standardized "battery service" which contains one characteristic "battery level".Ģ. The standard services and characteristics can utilize much smaller data packets as the Universally Unique Identifier (UUID) are 16 bits while custom services and characteristics must utilize 128 bits for their UUIDs. First, check these to see if you can co-opt any of the standardized services and characteristics. Can we use any of the standard services & characteristics?īluetooth SIG has standardized many common services and characteristics. We also want to know when we need to charge the device, so we want to read the battery level and transmit that to our mobile application.ġ. ![]() We want to collect gyroscope and acceleration measurements from three spatial axes and the time these measurements were taken and transmit this data to our mobile application. Let's consider an Arduino device that is collecting data from an accelerometer-gyroscope module (AGM). Okay, now you know what services & characteristics are, we need to figure out how to design some services & characteristics to get our custom data and send it from our GATT server (Arduino) to the client (Android App). ![]()
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