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+# BTB dat
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+
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+## base board
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+![](40-27-15-02-08-2023.png)
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+
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+
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+## attach board
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+
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+### lora
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+
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+- use UART as main interface
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+
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+![](47-32-15-02-08-2023.png)
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+
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+
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+### SIM7020
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+
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+- use UART as main interface
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+
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+![](54-48-15-02-08-2023.png)
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