diff --git a/snippets/test8.py b/snippets/test8.py
new file mode 100644
index 0000000..da3f39e
--- /dev/null
+++ b/snippets/test8.py
@@ -0,0 +1,119 @@
+import queue
+import datetime
+import threading
+
+class AbstractModbusDatapoint(object):
+    def __init__(self, label, unit, address, count):
+        self.label = label
+        self.unit = unit
+        self.address = address
+        self.count = count
+        self.type = 'abstract data point'
+
+    def __str__(self):
+        return "{0}, {1}: {2} {3} {4}".format(self.type, self.label, self.unit, self.address, self.count)
+
+class HoldingRegisterDatapoint(AbstractModbusDatapoint):
+    def __init__(self, label, unit, address, count, scanRate, publishTopic, subscribeTopic, feedbackTopic):
+        super(AbstractModbusDatapoint, self).__init__(label, unit, address, count)
+        self.scanRate = scanRate
+        self.publishTopic = publishTopic
+        self.subscribeTopic = subscribeTopic
+        self.feedbackTopic = feedbackTopic
+        self.writeRequestValue = None
+        self.lastContact = 0
+        self.type = 'read holding register'
+
+    def process(self):
+        successFull = False
+        giveUp = False
+        if self.writeRequestValue:
+            # perform write operation
+            if successFull:
+                # give feedback
+                self.writeRequestValue = None
+            else:
+                # retries handling
+                if giveUp:
+                    # give negative feedback
+                    self.writeRequestValue = None
+        else:
+            # perform read operation
+            if successFull:
+                self.lastContact = datetime.datetime.now()
+                # publish value
+            else:
+                # retries handling
+                if giveUp:
+                    # backoff and availability handling
+                    # give negative feedback
+                    pass
+    
+    def onMessage(self, value):
+        self.writeRequestValue = value
+
+
+class MqttProcessor(threading.Thread):
+    def __init__(self, registers, queue):
+        super(object, self).__init__()
+        self.registers = registers
+        self.queue = queue
+
+    def run(self):
+        pass
+        # set mqtt callbacks
+        # mqtt connect
+        # mqtt loop forever
+
+    def onConnect(self):
+        pass
+        # subscribe to all subscribe topics from registers
+
+    def onMessage(self, topic, payload):
+        pass
+        # call onMessage method of register with related subscribe topic
+        # put register yourself in high prio queue
+        # notify using event
+
+
+class ScanRateProcessingQueueFeeder(threading.Thread):
+    def __init__(self, registers, queue):
+        super(threading.Thread, self).__init__()
+        self.registers = registers
+        self.queue = queue
+
+    def run(self):
+        pass
+        # search registers with expired scanRate (lastContact + scanRate * backoff < now)
+        # put into low prio queue
+
+
+
+
+
+
+
+
+#  ModbusRequestDefinition(4, 0x2000, 2, 'F', '(ERR) Unavailable device'),
+#  ModbusRequestDefinition(1, 0x2000, 4, 'F', '(ERR) Wrong register size'),
+#  ModbusRequestDefinition(1, 0x2000, 2, 'F', 'Voltage'),
+#  ModbusRequestDefinition(1, 0x2020, 2, 'F', 'Frequency'),
+#  ModbusRequestDefinition(1, 0x2060, 2, 'F', 'Current'),
+#  ModbusRequestDefinition(3, 0x0004, 2, 'RF', 'Resistance Channel 1'),
+#  ModbusRequestDefinition(3, 0x000C, 2, 'RF', 'Temperature Channel 1'),
+#  ModbusRequestDefinition(3, 0x0014, 2, 'RF', 'Resistance Channel 2'),
+#  ModbusRequestDefinition(3, 0x001C, 2, 'RF', 'Temperature Channel 2'),
+
+
+datapoints = [
+    HoldingRegisterDatapoint('Voltage', 1, 0x2000, 2, 60.0, 'Pub/Voltage', None, None),
+    HoldingRegisterDatapoint('Frequency', 1, 0x2020, 2, 60.0, 'Pub/Frequency', None, None),
+    HoldingRegisterDatapoint('Current', 1, 0x2060, 2, 60.0, 'Pub/Current', None, None),
+    HoldingRegisterDatapoint('Resistance Channel 1', 2, 0x0004, 2, 1.0, 'Pub/ResistanceChannel1', None, None),
+    HoldingRegisterDatapoint('Temperature Channel 1', 2, 0x000c, 2, 1.0, 'Pub/TemperatureChannel1', None, None),
+    HoldingRegisterDatapoint('Resistance Channel 2', 2, 0x0014, 2, 1.0, 'Pub/ResistanceChannel2', None, None),
+    HoldingRegisterDatapoint('Temperature Channel 2', 2, 0x001c, 2, 1.0, 'Pub/TemperatureChannel2', None, None),
+    HoldingRegisterDatapoint('Relay1', 5, 0x0001, 1, 0.0, None, 'Sub/Relay1', 'Feedback/Relay1')
+]
+
+