[VOL-4111] Dinamically generating the MibDB during ONU creation and use
that to drive the MibUploadNextResponse generation

Change-Id: I67dbbe0700a7fbec802516fc6b2a9aff496022de
diff --git a/internal/bbsim/devices/uni_port.go b/internal/bbsim/devices/uni_port.go
new file mode 100644
index 0000000..78640e3
--- /dev/null
+++ b/internal/bbsim/devices/uni_port.go
@@ -0,0 +1,56 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+
+ * http://www.apache.org/licenses/LICENSE-2.0
+
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package devices
+
+import (
+	"fmt"
+	"github.com/looplab/fsm"
+	omcilib "github.com/opencord/bbsim/internal/common/omci"
+	log "github.com/sirupsen/logrus"
+)
+
+const maxUniPorts = 4
+
+type UniPort struct {
+	ID        uint32
+	MeId      omcilib.EntityID
+	OperState *fsm.FSM
+	Onu       *Onu
+}
+
+func NewUniPort(ID uint32, onu *Onu) (*UniPort, error) {
+
+	// IDs starts from 0, thus the maximum UNI supported is maxUniPorts - 1
+	if ID > (maxUniPorts - 1) {
+		return nil, fmt.Errorf("%d-is-higher-than-the-maximum-supported-unis-%d", ID, maxUniPorts)
+	}
+
+	uni := UniPort{
+		ID:   ID,
+		Onu:  onu,
+		MeId: omcilib.GenerateUniPortEntityId(ID + 1),
+	}
+
+	uni.OperState = getOperStateFSM(func(e *fsm.Event) {
+		onuLogger.WithFields(log.Fields{
+			"ID":    uni.ID,
+			"OnuSn": onu.Sn(),
+		}).Debugf("changing-uni-operstate-from-%s-to-%s", e.Src, e.Dst)
+	})
+
+	return &uni, nil
+}