I see, actually, I was used the phone sent the command to Wio terminal, it work very well, you may have a look at this link as a reference: https://www.hackster.io/fenyi/the-smartphone-communicates-with-the-wio-terminal-via-ble-faf90a
wish it can help you, and I sorry for the later reply, I am busy with other projects, but keep in touch, I will help.
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