How to clear cache on Android or iOS to read a BLE characteristic?

Question

A very strange thing happens on Android and iOS : when you want to "read" a BLE characteristic, it doesn't always issue a "read" to the connected device. It seems to read into a cache and return the value if there were no notification in between.

I have noticed that because I am making a step counter device and if I do the following :

• connect to device
• subscribe to step count notification
• make 100 steps
• disconnect
• make 15 more steps with my device
• connect and make a read
• I will read 100 instead of 115
• I make one more step and receive a notification. The count I receive is 116

on Windows (PC) when I do a read, there is this option BluetoothCacheMode . Is there such an option on Android or iOS ?

Answer 1

实际上，默认情况下，缓存是在固件中完成的