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Unfortunately, flow control is not available via the PUART on the module. This is why the RTS pin no longer appears as a GPIO option in the module datasheet. However, the feature is still available on the SoC.
This is because P1 (Referenced in the WICED™ Smart Hardware Interfaces document) is tied internally to the WP function of the internal EEPROM, so flow control is not available on the module.
Good thread on the subject here: Need clarification on PUART RTS/CTS flow control support