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I would like to record ros2 bag using node(python) and that should subscribe to several topics of different message types, may i know, how to to do that without using loops.

I would like to record like as below, but from multiple topics. Each subscription of all topics to be at same time stamp. https://docs.ros.org/en/humble/Tutorials/Advanced/Recording-A-Bag-From-Your-Own-Node-Py.html

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  • $\begingroup$ Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. $\endgroup$
    – Community Bot
    Commented Dec 1, 2023 at 8:38
  • $\begingroup$ Welcome to Robotics Stack Exchange! "...without using loops" what does it mean? $\endgroup$
    – ravi
    Commented Dec 2, 2023 at 13:34
  • $\begingroup$ I was trying like this to accomodate multiple topics. ` def setup_subscriptions(self): topics_and_types = { '/topic1': 'your_message_type1', '/topic2': 'your_message_type2', '/topic3': 'your_message_type3', } for topic, msg_type in topics_and_types.items(): self.create_subscription( msg_type=msg_type, topic=topic, callback=self.message_callback, ) ` $\endgroup$
    – bharadwajsirigadi
    Commented Dec 3, 2023 at 16:38

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After trying to do it myself, and inspecting the source code for the Writer classes in ros2bag_py library, it looks like it's just not possible. Did you manage to do it?

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