-
Notifications
You must be signed in to change notification settings - Fork 389
/
DriverContext.go
93 lines (85 loc) · 3.61 KB
/
DriverContext.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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
*
* https://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 s7
import (
"github.com/apache/plc4x/plc4go/protocols/s7/readwrite/model"
)
type DriverContext struct {
PassiveMode bool
CallingTsapId uint16
CalledTsapId uint16
CotpTpduSize model.COTPTpduSize
PduSize uint16
MaxAmqCaller uint16
MaxAmqCallee uint16
ControllerType ControllerType
awaitSetupComplete bool
awaitDisconnectComplete bool
}
func NewDriverContext(configuration Configuration) (DriverContext, error) {
callingTsapId := encodeS7TsapId(model.DeviceGroup_OTHERS, configuration.localRack, configuration.localSlot)
calledTsapId := encodeS7TsapId(model.DeviceGroup_PG_OR_PC, configuration.remoteRack, configuration.remoteSlot)
controllerType := configuration.controllerType
if controllerType == ControllerType_UNKNOWN {
controllerType = ControllerType_ANY
}
pduSize := configuration.pduSize
// The Siemens LOGO device seems to only work with very limited settings,
// so we're overriding some of the defaults.
if controllerType == ControllerType_LOGO && pduSize == 1024 {
pduSize = 480
}
// Initialize the parameters with initial version (Will be updated during the login process)
cotpTpduSize := getNearestMatchingTpduSize(pduSize)
// The PDU size is theoretically not bound by the COTP TPDU size, however having a larger
// PDU size would make the code extremely complex. But even if the protocol would allow this
// I have never seen this happen in reality. Making is smaller would unnecessarily limit the
// size, so we're setting it to the maximum that can be included.
pduSize = cotpTpduSize.SizeInBytes() - 16
maxAmqCaller := configuration.maxAmqCaller
maxAmqCallee := configuration.maxAmqCallee
return DriverContext{
CallingTsapId: callingTsapId,
CalledTsapId: calledTsapId,
ControllerType: controllerType,
CotpTpduSize: cotpTpduSize,
PduSize: pduSize,
MaxAmqCaller: maxAmqCaller,
MaxAmqCallee: maxAmqCallee,
}, nil
}
func getNearestMatchingTpduSize(tpduSizeParameter uint16) model.COTPTpduSize {
switch {
case model.COTPTpduSize_SIZE_128.SizeInBytes() >= tpduSizeParameter:
return model.COTPTpduSize_SIZE_128
case model.COTPTpduSize_SIZE_256.SizeInBytes() >= tpduSizeParameter:
return model.COTPTpduSize_SIZE_256
case model.COTPTpduSize_SIZE_512.SizeInBytes() >= tpduSizeParameter:
return model.COTPTpduSize_SIZE_512
case model.COTPTpduSize_SIZE_1024.SizeInBytes() >= tpduSizeParameter:
return model.COTPTpduSize_SIZE_1024
case model.COTPTpduSize_SIZE_2048.SizeInBytes() >= tpduSizeParameter:
return model.COTPTpduSize_SIZE_2048
case model.COTPTpduSize_SIZE_4096.SizeInBytes() >= tpduSizeParameter:
return model.COTPTpduSize_SIZE_4096
case model.COTPTpduSize_SIZE_8192.SizeInBytes() >= tpduSizeParameter:
return model.COTPTpduSize_SIZE_8192
}
return model.COTPTpduSize(0)
}