Function pamoja_gateway_uplink_new 

#[unsafe(no_mangle)]
pub extern "C" fn pamoja_gateway_uplink_new() -> *mut PamojaGatewayUplink

Creates an empty uplink for a PUSH_DATA to carry.

Returns

A handle the caller releases with pamoja_gateway_uplink_free, or hands to pamoja_gateway_push_data, which takes it over.