Function reference
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          create_config()
- Create config file if needed.
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          get_api_state()
- Check API state
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          get_telraam_token()
- Get the current authentication token for the 'Telraam' API
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          gg_availability()
- Availability and quality of sensors during a period through a heatmap.
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          gg_car_speed_histogram()
- Histogram of car speed over a period, for a segment or a subset of segment.
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          gg_car_speed_v85()
- Average of v85 car speed per hour over a period, for a segment or a subset of segment.
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          gg_traffic_avg()
- Average of traffic during a week.
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          gg_traffic_evolution()
- Evolution of traffic and smoothed traffic.
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          import_sensor()
- Imports data associated with a list of sensors
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          retrieve_sensor()
- Retrieves data associated with a sensor from the Telraam API
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          set_telraam_token()
- Saves an authentication token for the 'Telraam' API.
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          traffic
- Traffic data of Telraam sensors in Châteaubourg (FR)
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          write_update_data()
- Write or update the sensor data in the data folder