[TVM Discuss] [Questions] [iOS-RPC] Not able to connect RPC tracker on iOS device

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Hi Team,

I'm trying to connect iOS device via iOS RPC((https://github.com/apache/incubator-tvm/tree/master/apps/ios_rpc) app and i followed the below steps to connect the RPC tracker.

1. Opened  tvmrpc.xcodeproj  by using XCode.
2. Build and installed the iOS RPC application on the iPhone.
3. Started RPC tracker from host machine(MAC) using -->  "python -m tvm.exec.rpc_tracker --port 9090 --no-fork"
4. Tried to Connect iOS device to this RPC tracker via the TVM RPC application. 
Opened the app, set the  `Address`  and  `Port`  fields to the address and port of the RPC tracker respectively. The key set to be "iphone".
5. After pressing the connect to proxy in iOS RPC app i got below error from RPC tracker

    INFO:RPCTracker:bind to 0.0.0.0:9090
WARNING:RPCTracker:Invalid connection from TCPSocket: ('192.168.1.102', 50370)
lengthe of the message nn 21 b'q\xf2\x0f\x00\r\x00\x00\x00server:iphone'
RPC_TRACKER_MAGIC 193137
ERROR:asyncio:Exception in callback None()
handle: <Handle cancelled>
Traceback (most recent call last):
  File "/Users/sony/anaconda3/envs/AutoTVM2/lib/python3.8/asyncio/events.py", line 81, in _run
    self._context.run(self._callback, *self._args)
  File "/Users/sony/anaconda3/envs/AutoTVM2/lib/python3.8/site-packages/tornado/platform/asyncio.py", line 139, in _handle_events
    handler_func(fileobj, events)
  File "/Users/sony/.local/lib/python3.8/site-packages/tvm-0.7.dev1-py3.8-macosx-10.9-x86_64.egg/tvm/rpc/tornado_util.py", line 38, in _event_handler
    self._event_handler(events)
  File "/Users/sony/.local/lib/python3.8/site-packages/tvm-0.7.dev1-py3.8-macosx-10.9-x86_64.egg/tvm/rpc/tornado_util.py", line 75, in _event_handler
    if self._update_read() and (events & self._ioloop.WRITE):
  File "/Users/sony/.local/lib/python3.8/site-packages/tvm-0.7.dev1-py3.8-macosx-10.9-x86_64.egg/tvm/rpc/tornado_util.py", line 112, in _update_read
    self.on_message(msg)
  File "/Users/sony/.local/lib/python3.8/site-packages/tvm-0.7.dev1-py3.8-macosx-10.9-x86_64.egg/tvm/rpc/tracker.py", line 200, in on_message
    self._init_conn(message)
  File "/Users/sony/.local/lib/python3.8/site-packages/tvm-0.7.dev1-py3.8-macosx-10.9-x86_64.egg/tvm/rpc/tracker.py", line 183, in _init_conn
    magic = struct.unpack('<i', message)[0]
struct.error: unpack requires a buffer of 4 bytes

Failed to receive remote confirmation code.

Can you please help me to fix the above issue

Thanks,





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