This test verifies that the engine is capable of basic communication with an external engine.
If this test fails, ensure that you have followed each of the steps outlined below.
Whenever you add a new node, you must also add a call to MDI_Register_Node() to register support for that node.
Commands are registered separately for each node, so any commands that are supported at the new node must be registered for it.
For example, if you implement five nodes, and each of them supports the EXIT command, you will need to call the MDI_Register_Command() function five times, each time with a different node as the first argument and with EXIT as the second argument.