Reqest reading of flexifunction data

                target_system             : System ID (uint8_t)
                target_component          : Component ID (uint8_t)
                read_req_type             : Type of flexifunction data requested (int16_t)
                data_index                : index into data where needed (int16_t)

def flexifunction_read_req_send(self, target_system, target_component, read_req_type, data_index, force_mavlink1=False):
                '''
                Reqest reading of flexifunction data

                target_system             : System ID (uint8_t)
                target_component          : Component ID (uint8_t)
                read_req_type             : Type of flexifunction data requested (int16_t)
                data_index                : index into data where needed (int16_t)

                '''
                return self.send(self.flexifunction_read_req_encode(target_system, target_component, read_req_type, data_index), force_mavlink1=force_mavlink1)