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machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
  const getInfoStates = {
    initial: 'getCaseName',
    states: {
      getCaseName: {
        entry: ['aReqCaseName'],
        on: {
          tInputReady: { 
            //target: 'OpenedIO',
            actions: 'aReadToken'
          },
          tRcvdCaseName: {
            actions: ['aSaveCaseName'],
            target: 'getCaseSize',
          },
        },
      },
      getCaseSize: {
        entry: ['aReqCaseSize'],
        on: {
          tInputReady: { 
            //target: 'OpenedIO',
            actions: 'aReadToken'
          },
          tRcvdCaseSize: {
            actions: ['aSaveCaseSize'],
            target: 'end',
          },
        }
      },
      end: {
        entry: 'Push_tGotInfo',
        type: 'final',
      }
    }
  };
  
  const getTracksStates = {
    initial: 'getCaseName',
    states: {
      getCaseName: {
        entry: ['aReqCaseName'],
        on: {
          tInputReady: { 
            //target: 'OpenedIO',
            actions: 'aReadToken'
          },
          tRcvdCaseName: {
            actions: ['aSaveCaseName'],
            target: 'getCaseSize',
          },
        },
      },
      getCaseSize: {
        entry: ['aReqCaseSize'],
        on: {
          tInputReady: { 
            //target: 'OpenedIO',
            actions: 'aReadToken'
          },
          tRcvdCaseSize: {
            actions: ['aSaveCaseSize'],
            target: 'end',
          },
        }
      },
      end: {
        entry: 'Push_tGotInfo',
        type: 'final',
      }
    }
  };
  

  
  const goalMachine = Machine({
    id: 'goal',
    initial: 'disconnected',
    context: {
      retries: 0
    },
    states: {
      disconnected: {
        on: {
          tGetSrvId: {
            target: 'Open', 
            actions: ['aGetSrvId'],
          },
          tGetInfo: {
            target: 'Open',
            actions: 'qGetInfo'
          },
          tReqTrack: {
            target: 'Open',
            actions: 'aReqTrack'
          },
          tGetTracks: {
            target: 'Open',
            actions: 'qGetTracks'
          },
          tRetry: {
            target: 'Open',
            actions: 'aRetry'
          },
          tTimeout: {
            target: 'End',
            actions: 'aEndComm'
          },
        },
      },
      
      Open: {
        entry: ['aOpen'],
        on: {
          tOpened: {
            target: 'Opened',
            actions: 'aOpened'
          },
          tRetry: {
            actions: 'aRetryStartComm'
          },
          tNetError: {
            target: 'End',
            actions: 'aStartCommError'
          },
          tTimeout: {
            target: 'End',
            actions: 'aStartCommTmout'
          },
        },
      },

      Opened: {
        on: {
          tGetTermId: {
            target: 'TermId',
            actions: 'aSendTermId'
          },
          tAutoAccept: {
            //target: 'OpenedIO',
          },
          tServerId: { 
            //target: 'OpenedIO',
            actions: 'aSaveSrvId'
          },
          tHostVersion: { 
            //target: 'OpenedIO',
            actions: 'aSaveSrvVer'
          },
          tInputReady: { 
            //target: 'OpenedIO',
            actions: 'aReadToken'
          },
          tOutputDone: {
            //target: 'CommStarted',
            actions: 'aOutReady'
          },
          tNetError: {
            target: 'End',
            actions: 'aError'
          },
        }
      },

      TermId: {
        //entry: ['aSendTermId'],
        on: {
          tGetClientVer: {
            target: 'ClientVer',
            actions: ['aSendClientVersion'],
          },
          tAutoAccept: {
            //target: 'OpenedIO',
          },
          tServerId: { 
            //target: 'OpenedIO',
            actions: 'aSaveSrvId'
          },
          tHostVersion: { 
            //target: 'OpenedIO',
            actions: 'aSaveSrvVer'
          },
          tInputReady: { 
            //target: 'OpenedIO',
            actions: 'aReadToken'
          },
          tOutputDone: {
            //target: 'CommStarted',
            actions: 'aOutReady'
          },
          tNetError: {
            target: 'End',
            actions: 'aError'
          },
        }
      },

      ClientVer: {
        on: {
          tOutputDone: {
            target: 'Connected',
            actions: 'aOutReady'
          },
          tInputReady: { 
            //target: 'OpenedIO',
            actions: 'aReadToken'
          },
          tNetError: {
            target: 'End',
            actions: 'aError'
          },
          
        }        
      },
      
      Connected: {
        entry: ['aPopGoal'],
        on: {
          tGetSrvId: {
            //target: 'Open', 
            actions: ['aGetSrvId'],
          },
          tGetInfo:   'GetInfo',
          tGetTracks: 'GetTracks',
          tReqTrack: {
            target: 'Open',
            actions: 'aReqTrack'
          },
          
        }
      },
      
      GetInfo: {
        on: {
          tGotInfo: {
            target: 'Connected',
          },
          tNetError: {
            target: 'End',
            actions: 'aError'
          },
        },
        ...getInfoStates
      },
      
      GetTracks: {
        on: {
          tGotTracks: {
            target: 'Connected',
          },
          tNetError: {
            target: 'End',
            actions: 'aError'
          },
        },
        ...getTracksStates
      },

      End: {
        type: 'final'
      },
      
      getSrvId: {
          //...connectionStates,
      },

      start: {
        on: {
          FETCH: 'loading'
        }
      },
      loading: {
        on: {
          RESOLVE: 'success',
          REJECT: 'failure'
        }
      },
      success: {
        type: 'final'
      },
      failure: {
        on: {
          RETRY: {
            target: 'loading',
            actions: assign({
              retries: (context, event) => context.retries + 1
            })
          }
        }
      }
    }
  },
  {
    actions: {
      // action implementations
      commStart: (context, event) => {
        console.log('commStarting...');
        socket.open("1.2.3.4", 1234,
          ()=> { //success callback
          },
          (err)=> { //error callback
          }
        );
      },
      activate: (context, event) => {
        console.log('activating...');
      },
      notifyActive: (context, event) => {
        console.log('active!');
      },
      notifyInactive: (context, event) => {
        console.log('inactive!');
      },
      sendTelemetry: (context, event) => {
        console.log('time:', Date.now());
      }
    }
  }
    
);