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Fix small index compare bug in modbus
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@ -47,7 +47,7 @@ bool Modbus::parse_modbus_byte_(uint8_t byte) {
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uint8_t function_code = raw[1];
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// Byte 2: Size (with modbus rtu function code 4/3)
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// See also https://en.wikipedia.org/wiki/Modbus
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if (at == 2)
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if (at <= 2)
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return true;
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uint8_t data_len = raw[2];
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