Telemetry Viewer has fatal exception when called with JSON-RPC method display

[fr33zer]

While testing, found that the move method is not defined for Cosmos::Screen:

2017/09/26 14:17:38.335  FATAL: Fatal Exception! Exiting...
2017/09/26 14:17:38.348  FATAL: NoMethodError : undefined method `move' for #<Cosmos::Screen:0x00000002fd9600>
Did you mean?  mode
/opt/ruby-2.3.3/lib/ruby/gems/2.3.0/gems/cosmos-3.8.3/lib/cosmos/tools/tlm_viewer/screen.rb:353:in `method_missing'
/opt/ruby-2.3.3/lib/ruby/gems/2.3.0/gems/cosmos-3.8.3/lib/cosmos/tools/tlm_viewer/screen.rb:353:in `process'
/opt/ruby-2.3.3/lib/ruby/gems/2.3.0/gems/cosmos-3.8.3/lib/cosmos/tools/tlm_viewer/screen.rb:233:in `initialize'
/opt/ruby-2.3.3/lib/ruby/gems/2.3.0/gems/cosmos-3.8.3/lib/cosmos/tools/tlm_viewer/tlm_viewer.rb:489:in `new'
/opt/ruby-2.3.3/lib/ruby/gems/2.3.0/gems/cosmos-3.8.3/lib/cosmos/tools/tlm_viewer/tlm_viewer.rb:489:in `block in display'
/opt/ruby-2.3.3/lib/ruby/gems/2.3.0/gems/qtbindings-4.8.6.3/lib/Qt4.rb:96:in `block in execute_in_main_thread'
/opt/ruby-2.3.3/lib/ruby/gems/2.3.0/gems/qtbindings-4.8.6.3/lib/Qt4.rb:49:in `callback_timeout'
/opt/ruby-2.3.3/lib/ruby/gems/2.3.0/gems/qtbindings-4.8.6.3/lib/Qt/qtruby4.rb:479:in `qt_metacall'
/opt/ruby-2.3.3/lib/ruby/gems/2.3.0/gems/qtbindings-4.8.6.3/lib/Qt/qtruby4.rb:479:in `method_missing'
/opt/ruby-2.3.3/lib/ruby/gems/2.3.0/gems/qtbindings-4.8.6.3/lib/Qt/qtruby4.rb:479:in `exec'
/opt/ruby-2.3.3/lib/ruby/gems/2.3.0/gems/cosmos-3.8.3/lib/cosmos/gui/qt_tool.rb:292:in `block in run'
/opt/ruby-2.3.3/lib/ruby/gems/2.3.0/gems/cosmos-3.8.3/lib/cosmos/top_level.rb:692:in `set_working_dir'
/opt/ruby-2.3.3/lib/ruby/gems/2.3.0/gems/cosmos-3.8.3/lib/cosmos/gui/qt_tool.rb:273:in `run'
/opt/ruby-2.3.3/lib/ruby/gems/2.3.0/gems/cosmos-3.8.3/lib/cosmos/tools/tlm_viewer/tlm_viewer.rb:580:in `block in run'
/opt/ruby-2.3.3/lib/ruby/gems/2.3.0/gems/cosmos-3.8.3/lib/cosmos/top_level.rb:512:in `catch_fatal_exception'
/opt/ruby-2.3.3/lib/ruby/gems/2.3.0/gems/cosmos-3.8.3/lib/cosmos/tools/tlm_viewer/tlm_viewer.rb:530:in `run'
...

Here is a python script to demonstrate this exception:

import socket
import struct
import json

def request(message):
	port = 7778
	address = '127.0.0.1'
	with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
		s.connect((address, port))
		print('Sending:\n', message)
		size = len(message)
		packedSize = struct.pack('>I', size)
		s.send(packedSize)
		s.send(message.encode())
		data = s.recv(1024)
		print('Received:\n', repr(data))

request('{\"jsonrpc\": \"2.0\", \"method\": \"display\", \"params\": [\"COSMOS LIMITS_CHANGE\", \"1\", \"1\"], \"id\": 1}')

[ghost]

@ryanatball I'm assigning this to you because I had issues running the Python API when trying to test this. Can you verify it still works?

[ghost]

This is happening because you are passing the move position as strings. "1", "1". It should handle that without crashing, but the workaround is to pass them as integers.