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Recently, a friend asked me to help debug a Bluetooth printer. I had no choice but to take on the task, so I immediately bought an HC-05 Bluetooth module (note that it is HC-05).
Below, I will share my debugging method:
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Power on while pressing the button to enter AT mode
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Obtain module information (hold the button)
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AT+RMAAD
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AT+CMODE=0 Allow all devices to connect
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AT+INIT (press the button)
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AT+INQ
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AT+PAIR=2,A,544CF,9
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AT+BIND=2,A,544CF
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AT+CMODE=1
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AT+LINK=2,A,544CF
Computer Software Connection Setup Steps
1. Power on while holding the button, hold the button to get module information

2. AT+RMAAD
Input to disconnect all links
3. AT+CMODE=0 Allow all devices to connect
4. Binding address: Fill in the printer address. Click to update module information
If it shows AT+BIND=2,a,544cf

OK
Then the setup is successful.
Method to Obtain Printer Device Address
1. AT+INIT (press the button)
2. AT+INQ
Scanning devices may take some time, please be patient.
/ The End /
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