T-QT-C6 connectivity connector.
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What was a reason to make a hardwired connector for UART instead of using the standard and flexible configurable connectivity (UART/I2C/GPIO)?
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In addition:
Also, why the external pins are not vertically organized in the 2 rows for easy connection, for instance I2C pins such as IO22, IO21, 3.3V, GND (4pins header) which it will allow to use a standard 4pins dupont header to Grove cable.