RE: The function readCharacteristic() of Android-BLE-Library-2.4.0 can't read all data

Aleksander Nowakowski — Fri, 01 Apr 2022 12:23:47 GMT

Hello,

When you're reading from a characteristic, and the value is longer than the MTU, the stack will use Long Read Procedure. This internally uses ATT_READ_BLOB_REQ for requesting more and more data. Although the maximum characteristic value length is 600 bytes, this blobs can in theory go all the way until 65536 bytes, but many implementations, like blueZ, limit the value to 600.

Have a look at: https://stackoverflow.com/a/52996807/2115352

In BLE library you can instead use `merge` method available in the ReadRequest or ValueChangedRequest. This allows will make multiple read calls until your merge method returns true.