How to write an opcode 0x02 over BLE using a service characteristic

Question

Subhrajit Das 2023-1-3

0
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https://ww2.mathworks.cn/matlabcentral/answers/1888052-how-to-write-an-opcode-0x02-over-ble-using-a-service-characteristic

回答： Vanshika Vaishnav 2023-3-9

I am using a RSL10 eval board. I want to control the eval board over one of its service characteristics knows as Control Point Characteristic. The Control Point characteristic value consists of 1 octet opcode that defines what kind of request is being made followed by 0 or more octets with command specific arguments.This characteristic allows only Write Without Response property or optionally also Write property. How can I write an opcode over BLE for this characteristic? I have tried

contpoint=characteristic(b,"00000004-0001-0362-B5DA-012DD27485F8","00000004-0002-0362-B5DA-012DD27485F8")
write(contpoint,uint8(hex2dec('1')),"withresponse")

but this does not work with message unknown error.

Please let me know how to solve this.