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The rosbag player provides a pause_playback service of type std_srvs/SetBool.

Since the play will be started as anonymous node, the service will be available as /play_<unique_number>/pause_playback.

To pause the playback, call the service with data: true:

rosservice call /play_<unique_number>/pause_playback "data: true" 
success: True
message: "Playback is now paused"

and to un-pause, with data: false:

rosservice call /play_<unique_number>/pause_playback "data: false" 
success: True
message: "Playback is now resumed"

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