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A guy from my laboratory found the solution:

There was king of a communication problem, so the subscriber qos profile had to be redefined :

qos_sensor = QoSProfile(
    reliability=QoSReliabilityPolicy.RMW_QOS_POLICY_RELIABILITY_BEST_EFFORT,
    history=QoSHistoryPolicy.RMW_QOS_POLICY_HISTORY_KEEP_LAST,
    depth=1
)


self.get_logger().info('Use QoS Sensor')

self.subscription = self.create_subscription(
    PoseStamped,
    'Turtle_2/pose',
    self.listener_callback,
    qos_profile=qos_sensor)

Thanks to everyone who tried to help

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