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machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
  const incrementRetries = assign({
    retries: (ctx) => ctx.retries +1
  })
  
  const resetRetries = assign({ retries: 0 })
  
  const isAutoConnect = (ctx) => ctx.autoConnect
  
  const ppStates = {
    id: 'ping-pong',
    initial: 'waitingresp',
    states: {
      on: {
        PONG: 'waitingresp'
      }
    }
  }
  
  const websocket = Machine({
    id: 'websocket',
    initial: 'idle',
    context: {
      retries: 0,
      autoConnect: true
    },
    states: {
      idle: {
        on: {
          OPEN: 'connecting'
        }
      },
      connecting: {
        on: {
          SUCCESS: 'connected',
          ERROR: 'failure'
        }
      },
      connected: {
        entry: resetRetries,
        ...ppStates
      },
      failure: {
        on: {
          RETRY: {
            target: 'connecting',
            actions: incrementRetries,
          }
        },
        after: {
          RETRY_DELAY: {
            target: 'connecting', 
            cond: isAutoConnect,
            actions: incrementRetries
          }
        }
      }
    }
  },{
    delays: {
      RETRY_DELAY: (ctx, ev) => 500 
    }
  })