Improvements at cmd interface

src/RegisterDatapoint.py

@@ -0,0 +1,103 @@
+import datetime
+
+
+
+class AbstractModbusDatapoint(object):
+    def __init__(self, label, unit, address, count, scanRate):
+        self.label = label
+        self.unit = unit
+        self.address = address
+        self.count = count
+        self.scanRate = scanRate
+        self.type = 'abstract data point'
+        self.enqueued = False
+        if self.scanRate:
+            self.priority = 1
+        else:
+            self.priority = 0
+
+    def __str__(self):
+        return "{0}, {1}: Unit: {2},  Address: {3}, Count: {4}".format(self.type, self.label, self.unit, self.address, self.count)
+
+    def process(self):
+        raise NotImplementedError
+
+
+class HoldingRegisterDatapoint(AbstractModbusDatapoint):
+    def __init__(self, label, unit, address, count, scanRate, publishTopic, subscribeTopic, feedbackTopic):
+        super().__init__(label, unit, address, count, scanRate)
+        self.publishTopic = publishTopic
+        self.subscribeTopic = subscribeTopic
+        self.feedbackTopic = feedbackTopic
+        self.writeRequestValue = None
+        self.lastContact = None
+        self.type = 'holding register'
+
+    def __str__(self):
+        return "[{0!s}, Read: {1}, Write: {2}, Feedback: {3}".format(super().__str__(), self.publishTopic, self.subscribeTopic, self.feedbackTopic)
+
+    def process(self):
+        successFull = False
+        giveUp = False
+        if self.writeRequestValue:
+            # perform write operation
+            print("Holding register, 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
+            print("Holding register, 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 InputRegisterDatapoint(AbstractModbusDatapoint):
+    def __init__(self, label, unit, address, count, scanRate, publishTopic):
+        super().__init__(label, unit, address, count, scanRate)
+        self.publishTopic = publishTopic
+        self.lastContact = None
+        self.type = 'input register'
+
+    def __str__(self):
+        return "[{0!s}, {1}".format(super().__str__(), self.publishTopic)
+
+    def process(self):
+        successFull = False
+        giveUp = False
+        # perform read operation
+        print("Input register, 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 checkRegisterList(registers):
+    for r in registers:
+        if not isinstance(r, AbstractModbusDatapoint):
+            raise ValueError('Entry in register list {0!s} is not derived from class AbstractModbusDatapoint'.format(r))        
+
+