feat: add empty and refill unit machine actions

fix: remove certain actions from the state middleware after being consumed by the poller

lib/routes/unitsRoutes.js

@@ -0,0 +1,34 @@
+const express = require('express')
+const { emptyMachineUnits, refillMachineUnits } = require('../machine-loader')
+const router = express.Router()
+
+const emptyUnitUpdateCounts = (req, res, next) => {
+  const deviceId = req.deviceId
+  const newUnits = req.body.newUnits
+
+  return emptyMachineUnits({ deviceId, cashUnits: newUnits })
+    .then(() => res.sendStatus(200))
+    .catch(e => {
+      console.error(e)
+      return res.sendStatus(500)
+    })
+    .finally(next)
+}
+
+const refillUnitUpdateCounts = (req, res, next) => {
+  const deviceId = req.deviceId
+  const newUnits = req.body.newUnits
+
+  return refillMachineUnits({ deviceId, cashUnits: newUnits })
+    .then(() => res.sendStatus(200))
+    .catch(e => {
+      console.error(e)
+      return res.sendStatus(500)
+    })
+    .finally(next)
+}
+
+router.post('/empty', emptyUnitUpdateCounts)
+router.post('/refill', refillUnitUpdateCounts)
+
+module.exports = router