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which is represented internally as “.1.3.6.1.4.1.318.1.1.4.5.2.1.3”.This string is then
appended with “.<outlet-number>” to specify the outlet. The OID, and some data, if the
operation is a SET, are packaged into a PDU which is then sent to the Masterswitch using the
JSNMP SnmpSession object.
The SNMP agent on the Masterswitch interface board then performs the appropriate action,
resulting in an SNMP response being returned. The response packet is processed, resulting in the
executing thread returning to the caller.
4.3.4 Synchronisation
The SNMPMasterswitch is a multithreaded object. Calls to Masterswitch methods are blocked
and queued implicitly by Java synchronization. The blocked threads are then woken by either
a timeout or an SNMP response message from the device.
4.3.5 Event notification
There are two alternative methods used to notify MasterswitchListeners of any state
changes:
• Responding to SNMP Traps
The Masterswitch generates SNMP traps for numerous events. These traps can be
decoded to discover events that have occurred on the Masterswitch. A complete
specification of Masterswitch traps is provided in [ 27 ] and [ 28 ]. Root permissions are
required by the SNMPTrapDaemon to bind itself to UDP port 162. This method is more
efficient and also provides more accurate error information.
• Polling
A TimerTask periodically queries the state of the Masterswitch and compares the new
information with cached values. A Masterswitch event is triggered if a change is
detected.
Upon initialisation, the SNMPMasterswitch will attempt to listen to SNMP traps by starting the trap
daemon. If this fails, a polling technique will be used, querying the Masterswitch every three
seconds.
4.4 JAS integration
To allow portability, all code integrating the Masterswitch to the JAS is handled in the
JASMasterswitch and Command Objects. Leaving the apt.masterswitch package an
independent software module.
The JASMasterswitch object has several responsibilities:
• Initialise the SNMP implementation of the Masterswitch
• Send status information as JASStatusMessages to clients
- Oliver Mather 1
- Abstract 3
- Acknowledgements 5
- Contents 7
- List of Figures 9
- 1 Introduction 11
- 2 APT hardware 13
- 2.3 Mistral 14
- 2.4 Telescope 14
- 2.5 CCD 16
- 2.6 Telescope movement 16
- 2.6.1 Anti backlash motor 17
- 2.6.2 Limit switches 18
- 2.6.3 Tilt sensor 19
- 2.6.4 Macrostation 19
- 2.7 Masterswitch 20
- 2.8 Web cameras 21
- 2.10 Roof 22
- 2.11 ROTSE 23
- ParralelRS232RS232 24
- 3 APT software 25
- 3.3 Command line tools 26
- 3.4.1 Introduction 27
- 3.4.2 Architecture 27
- 3.5 APT server 28
- 4.1 Introduction 31
- 4.3 Code 32
- 4.3.2 Configuration 33
- 4.3.3 SNMP messages 33
- 4.4 JAS integration 34
- 4.4.1 Commands 35
- 4.4.2 Messages 36
- 4.5 Screenshots 37
- 4.6 Conclusion 38
- 5.1 Introduction 39
- 5.2 Architecture 40
- 5.3 Process manager 40
- 5.4 Roof 41
- 5.5 Chat system 43
- Figure 5-8 APT chat system 44
- 5.6 Look and Feel 45
- 5.6.2 Problems 46
- 5.6.3 Screenshots 46
- 5.7 Conclusion 47
- 6 APT software deployment 49
- 6.3.1 Versioning 50
- 6.3.2 Security 51
- 6.4 Compilation 52
- 6.5 Version synchronisation 55
- 6.6 Uploading 56
- 6.7 Conclusion 57
- 7.1 Introduction 59
- 7.2 Hardware 59
- 7.3 Software 59
- 7.3.2 Maintenance 60
- 7.3.3 Client SP server 60
- 7.3.4 Client error control 60
- 7.4 Conclusion 62
- 8 SkinnedTextField 63
- 8.4 TextSkin 64
- 8.5 SkinnedTextFieldDemo 65
- 9 CSIRO SEARFE project 69
- 9.3 Requirements 70
- 9.4 Hardware 71
- 9.5 Architecture 71
- 9.5.1 Data files 72
- 9.6 User interface 73
- 9.6.2 Data visualisation 76
- 9.7.1 Visualisations 80
- 9.8 Conclusion 81
- 10 Conclusion 83
- 10.4 Logging analysis 84
- Bibliography 87
- A. Glossary 89
- B.1. Introduction 91
- B.2. JAS message sender 91
- B.4. Creating JAS commands 91
- B.4.1. JASCommand object 92
- B.4.2. Installing commands 92
- B.5. JAS channel monitoring 93
- C. Software tools 95
- C.1.3. Checkout the code 96
- C.1.4. CVS user interfaces 96
- D. SNMP overview 97
- Response 98
- RequestRequest 98
- E. Astronomy primer 99
- E.1.3. Coordinate epochs 100
- E.2. Astronomical times 101
- E.3. Gamma ray bursts 102
- E.4. Astronomical filters 102
- E.5. Flat fielding 103
- E.6. Cosmic rays 103
- F. Selected code listings 105
- F.1.6. SnmpTrapDaemon.java 121
- F.2. APT deployment system 132
- F.2.3. apt build.xml 134
- F.2.4. lib build.xml 141
- F.3. CSIRO / SEARFE 144
- F.4. TextSkin 145
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