User's Manual

Now from LightBlue window, if we tap the “Read” button for UUID 0x2A19, the
returned value should show 63 in hex and 99 in decimal. Figure 5 shows the reading
of Battery Level in Battery Service:
Figure 5: Reading Battery Level in Battery Service
LightBlue could also start notification on Battery Level characteristic by click button
“Start Notify” within LightBlue window. On RN4020 side, a notification should be
output to the screen shows as follows:
WC,180F,2A19,0002,0100
It means that LightBlue tried to write 2 octets value 0x0001 (little endian over air
makes it 0100) to configuration handle of Battery Level characteristic with UUID
0x2A19 in Battery Service with UUID 0x180F, effectively enabling notification for
this characteristic. (Check Bluetooth Core Specification Volume 3, Part G, section
3.3.3.3 table 3.11 for details)