Connected robotic applications increasingly rely on wireless communication for teleoperation, coordination, and distributed autonomy. However, robotic simulators often use ideal links or abstract delay models that do not capture cellular scheduling and protocol processing effects. We present 5G NetBotSim, a realtime co simulation framework integrating ROS/Gazebo workloads with an executable, full stack srsRAN 5G network emulator. The framework provides isolated User Equipment (UE) robot contexts and stage level timing across the host, gNB, UE, ROS, and robot execution stages. We evaluate human to robot teleoperation and robot to robot leader follower coordination under controlled channel quality conditions. Results show how CQI and MCS variations propagate to throughput, communication latency, and robot performance. In leader follower coordination, higher channel quality reduces mean tracking error from 0.558 m to 0.460 m, a 17.6% reduction. These results demonstrate protocol stack in the loop co simulation for joint network and robotic-application evaluation.

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