How to avoid Queue limit reached warning when subscribing to a topic.

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This happens when the publisher cannot send messages over the wire faster than then messages are generated.

You can try slowing down log playback. If you have a system plugin, you could manually step through the log file with some delay between steps.

You can also try increasing the queue limit, which is an argument to the Advertise function. For example, the ~/physics/contacts topic is advertised in ContactManager::Init with a queue size of 50:

  this->contactPub =
    this->node->Advertise<msgs::contacts>("~/physics/contacts", 50);

If you're compiling gazebo from source, you can increase these limits, though it may increase gazebo's memory usage or cause message passing to be more sluggish. Use at your own risk.