Does the simulated communication delay affect the fusion map?

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Hello, I am a beginner. The work I am doing is to simulate the scene of poor communication in reality based on ROS multi-agent mapping. The slam algorithm I use is gmapping, and the map fusion algorithm uses multirobot_map_merge. I try I added a timer to the callback function of the integrated map function package subscriber, so that it can be subscribed every certain time, but in the end it has no effect on the construction of the map. Can anyone give me some advice, thank you