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Our Deliverable to Opensense Partners

A Mobile Experimentation Platform for Opensense Jan Beutel Olga Saukh Jayashree Ajay-Candadai Lothar Thiele . Our Deliverable to Opensense Partners. A box (to be mounted on top of a vehicle) Autonomous (no wires, no external power) Connectivity, location awareness (GPS, cell information)

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Our Deliverable to Opensense Partners

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  1. A Mobile Experimentation Platform for OpensenseJan Beutel Olga SaukhJayashree Ajay-CandadaiLothar Thiele

  2. Our Deliverable to Opensense Partners • A box (to be mounted on top of a vehicle) • Autonomous (no wires, no external power) • Connectivity, location awareness (GPS, cell information) • Can connect to a number of sensors or WSN nodes • Cameras • Reference weather station • Tiny-node based platforms • SensorScope • PermaSense WSN • Custom sensors

  3. CoreStation with Stacked WLAN Router Gumstix Verdex WLAN Router TinyNode GSM EMP Protectors IP68 Enclosure and Connectors

  4. CoreStation Details • Powerful embedded Linux • PXA270 XScale CPU • 128 MB/32 MB • Flash Disks • Multiple communication options • WLAN/Ethernet • 3G/4G • Interfaces • Power-switchable USB • Analog/digital • Power control/profiling • Python/Java/C programming @12V

  5. Data Management Tools and Dataflow

  6. Data Management Overview • Global Sensor Network (GSN) • Data streaming framework from EPFL • Organized in “virtual sensors”, i.e. data types/semantics • Hierarchies and concatenation of virtual sensors enable on-line processing • Translates data from machine representation to SI values • Adds metadata http export Import from field GSN GSN Private Public Metadata ============== Position Sensor type …

  7. Multi-site, Multi-station Data Integration

  8. CoreStation Integration Local DB: BacklogData is synchronized with GSN De/Multiplexing into tables

  9. Managing Temporal Changes

  10. Example: Backlog/CoreStation

  11. Example: Private GSN Data Intake

  12. Example: Public GSN Data Mapping

  13. A Practical Remark

  14. GSN Performance Problems!!! load averages: 2.82, 2.81, 3.27 07:40:21 133 processes: 131 sleeping, 2 on cpu Memory: 16G real, 2518M free, 2567M swap in use, 24G swap free PID USERNAME THR PRI NICE SIZE RES STATE TIME CPU COMMAND 24854 mysql 46 0 0 692M 638M cpu/2 238.8H 32.13% mysqld 12094 perma 63 2 19 507M 485M sleep 138:28 18.25% java 29304 openldap 27 59 0 510M 43M sleep 19.8H 2.59% slapd 1222 daemon 76 60 -20 5880K 2152K sleep 268.8H 1.12% nfsd • “… the query with 'LIMIT 2' took more than 80slong…“ • Our largest table are 5’000’000 to 8’000’000 entries

  15. Coming Up Next…

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