User's Manual

Figure 8: Reading Private Characteristic
LightBlue could also write or start notification on characteristic
0x111213141516171819101A1B1C1D1E1F. The effect is the same as operating on
a public characteristic. The only difference to RN4020 user is that public
characteristic has short 16-bit UUID, while private characteristic has long 16-byte
UUID.
Figure 9 shows writing value 0x3412 (little endian) to private characteristic
0x111213141516171819101A1B1C1D1E1F from LightBlue. On terminal emulator
of RN4020 module, following status message will show up, which means the value of
characteristic 0x111213141516171819101A1B1C1D1E1F (with handle 0x0020)
has been written as 0x3412.