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| − | The enrichment of observations is a group of actions and/or replacements that take place over an observation in the process of delivering it ot its final destination or topic. They are placeholder substitutions, geolocation substitutions, proximity updates.
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| − | === Placeholders substitution ===
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| − | A placeholder is a string with format #{placeholder_name} than can be used in certain fields of an observation where the placeholders substitution takes place. Actually there are three fields where this kind of substitution is considered:
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| − | * <code>topic</code>
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| − | * <code>producer</code>
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| − | * <code>targetthings</code>
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| − | Some substitutions occur in the process of building the observation in applications in the edge like the [[M2MBridge]] and others occur after the observation is sent to the AMTech's platform. This is mostly geolocation fields substitutions which is a special kind of placeholder substitution.
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| − | These are a couple of placeholders substitution that run in the M2MBridge:
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| − | * Access control placeholders
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| − | ** #{tenantId}
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| − | ** #{userId}
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| − | === Geolocation substitution ===
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| − | This is about doing placeholder substitution of a group of geolocation attributes than can be determined by using the <code>location</code> field of an observation. Based on the [[WKT]] that is given in the <code>location</code> field, a process of reverse geolocation is run and the address is determined when possible. These fields are then replaced if they appear in the <code>topic</code>, <code>producer</code> or <code>targetthings</code> fields of the original observation JSON.
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| − | * <code>#{country}</code> or <code>#{country_code}</code>
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| − | * <code>#{state}</code> or </code>#{province}</code>
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| − | * <code>#{postcode}</code> or <code>#{postal code}</code> or <code>#{zip code}</code>
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| − | * <code>#{city}</code> or <code>#{town}</code>
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| − | * <code>#{suburb}</code> or <code>#{residential}</code> or <code>#{city_district}</code> or <code>#{municipality}</code> or <code>#{neighbourhood}</code>
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| − | === Proximity updates ===
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| − | A proximity update is executed when an observation arrives to the system containing information about proximity in its <code>targetthings</code> field. For instance:
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| − | {
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| − | ...
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| − | "targetthings": "[{
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| − | \"thingType\": \"/amtech/linkeddata/types/composite/entity/smartphone\",
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| − | \"thingsId\": [\"main_phone_1\"],
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| − | \"proximityarea\": \"/some/uri/for/proximity/thing\"
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| − | }]",
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| − | ...
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| − | }
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| − | Using this information, the field <code>proximityarea</code> of the thing <code>/amtech/things/entities/smartphone/main_phone_1</code> is updated with the given <code>proximityarea</code> in the observation.
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