Review on HiLetgo Bluetooth Wireless Compatible Arduino by Marlo Schlachter
I was working on my project. Do not use the "? " character when entering AT commands.
Just a warning, this is a HM-10 clone so some of the information you will find online about the HM-10 will be slightly different. Also let me save you the headache of figuring out AT commands with this module, don't use "?" characters when typing AT commands. That's all. Otherwise, you'll get an error message if you try to type something like "AT+ROLE?". I've attached an image of the available AT commands that the module writes when you type "AT+HELP".
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