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Arduino With HC-05 (ZS-040) Bluetooth Module €� AT MODE




For instance, here I’m sending the value “14”, and because the baud rate is set to 9600 the line appears to be long because the settings are using a different type of parity, but it’s actually 4 bytes of 7 bytes, the 7 remaining bytes being the string “14”. In this mode the changes that you make are applied to the next data packet that you send, so you have to be careful that you don’t keep sending the same data over and over again. As I said, both of these modes are going to be useful when you are debugging, but I want to focus on the second mode, as it’s the one you will use most of the time.  Because the RFCOMM protocol is symmetric, I’m not going to explain how to send messages, but there are a few things you need to keep in mind: 1. The first byte is always going to be 0xFE, which will give the length of the following packet. 2. The only two values that you can send are 0x00 (EOF) and 0x01 (8-bit character), you’ll find those values in the documentation. 3. The checksum is calculated as the last byte of the packet plus two’s complement of the previous 7. 4. Don’t forget to add the null termination byte to the data. Here is a small example of sending the characters “Hej”: ``` 0000 fe cc ef 0010 e8 00 0f 0020 05 48 65 6c 6c 0030 61 6c 20 63 6f 0040 72 6f 20 6c 6f 0050 20 62 6f 72 65 0060 6c 65 20 6c 61 0070 6c 6f 73 20 6f 0080 6e 65 74 20 63 0090 6f 72 20 20 6f 00a0 75 6e 65 73 20 00b0 6e 65 72 20 7d 00c0 6f 66 20 20 6f 00d0 6c 6f 20 6c 20 00e0 7a 6f 6c 69 6e 00f0 7a 20 62 6f 72 0100 7a 6f 6c 20 6c 0110 6f 72 20 6c




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