Added Scanner identification and MQTT handling

booker/models.py

@@ -1,3 +1,18 @@
 from django.db import models
+from django.conf import settings
+from homelog.system_user import get_deleted_user
 
-# Create your models here.
+
+class Scanner(models.Model):
+    named_id = models.CharField(max_length=40, unique=True)
+    description = models.CharField(max_length=200)
+    lwt_topic = models.CharField(max_length=200)
+    last_online_ts = models.DateTimeField('last datetime this scanner has been online')
+    assigned_channel_name = models.CharField(max_length=200)
+    assigned_group_name = models.CharField(max_length=200)
+    created_ts = models.DateTimeField('datetime created', auto_now_add=True)
+    created_by = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.SET(get_deleted_user),
+                                   related_name='created_scanners')
+    changed_ts = models.DateTimeField('datetime updated', auto_now=True)
+    changed_by = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.SET(get_deleted_user),
+                                   related_name='changed_scanners')