Add a model for rfid readers.

src/biomon/models.py

@@ -168,6 +168,21 @@ class Room(TimestampedAbstractModel):
         return self.number
 
 
+class Reader(TimestampedAbstractModel):
+    ip_address = models.IPAddressField()
+    management_port = models.IntegerField()
+    room = models.OneToOneField('Room', verbose_name = _(u'Room'),
+            null=True, blank=True, on_delete=models.PROTECT)
+
+    @property
+    def first_letter(self):
+        return self.room and self.room.number[0].upper() or ''
+
+    def __unicode__(self):
+        return "{} {} {}:{}".format(_(u'Reader'), self.id, self.ip_address,
+            self.management_port)
+
+
 class MetricCheck(TimestampedAbstractModel):
     patient = models.ForeignKey(Patient, verbose_name=_(u'Patient'))
     date = models.DateField(_(u'Date of check'))