code: def remote():
      if (
          "TVM_TRACKER_HOST" in os.environ
          and "TVM_TRACKER_PORT" in os.environ
          and "RPC_DEVICE_KEY" in os.environ
      ):
          rpc_tracker_host = os.environ["TVM_TRACKER_HOST"]
          rpc_tracker_port = int(os.environ["TVM_TRACKER_PORT"])
          rpc_device_key = os.environ["RPC_DEVICE_KEY"]
          tracker = rpc.connect_tracker(
              rpc_tracker_host, rpc_tracker_port
          )
          remote = tracker.request(
              rpc_device_key, priority=0, session_timeout=600
          )
          return remote
      else:
          return None
  
imports: import os
  import tvm
  from tvm import rpc
  import pytest
label_desc: Use image node_id 1 for calling a global function with example usage: remote() and returns: remote, None