senml: Add SenML library.

This is a new library that doesn't follow any existing API.

The library is originally from
https://github.com/kpn-iot/senml-micropython-library.

micropython/senml/README.md

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+# Introduction
+
+The SenML library helps you create and parse [senml documents](https://tools.ietf.org/html/draft-ietf-core-senml-13)
+in both json and cbor format.
+
+# key features
+
+- Object oriented design.
+- built in support for [senml's unit registry](https://tools.ietf.org/html/draft-ietf-core-senml-12#section-12.1)
+- extensible for new data types
+- direct support to read/write in json and cbor format.
+- automatically adjusts record data with respect to base time, base value & base sum.

micropython/senml/docs/_config.yml

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+theme: jekyll-theme-slate

micropython/senml/docs/index.md

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+Welcome to the API documet site for the micro-python SenML library.
+
+The following api sections are available:
+
+- [senml-base](./senml_base): the base class for all senml objects.
+- [senml-pack](./senml_pack): the class that represents root documents.
+- [senml-record](./senml_record): the class that stores sensor measurements
+- [senml-unit](./senml_unit): the list of all unit names that can be used.
+
+
+
+Copyright (c) 2018 KPN
+Copyright (c) 2023 MicroPython

micropython/senml/docs/senml_base.md

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+
+# senml_base Module
+
+
+## senml_base.SenmlBase Objects
+
+
+the base class for all senml objects. 

micropython/senml/docs/senml_pack.md

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+
+# senml_pack Module
+
+
+## senml_pack.SenmlPack Objects
+
+
+represents a senml pack object. This can contain multiple records but also other (child) pack objects.
+When the pack object only contains records, it represents the data of a device.
+If the pack object has child pack objects, then it represents a gateway 
+
+### __enter__ 
+
+```Python
+__enter__(self)
+``` 
+
+for supporting the 'with' statement
+
+
+_returns_: self 
+
+### __exit__ 
+
+```Python
+__exit__(self, exc_type, exc_val, exc_tb)
+``` 
+
+when destroyed in a 'with' statement, make certain that the item is removed from the parent list.
+
+
+_returns_: None 
+
+### __init__ 
+
+```Python
+__init__(self, name, callback=None)
+``` 
+
+initialize the object
+
+_parameters:_
+
+- `name:` {string} the name of the pack 
+
+### __iter__ 
+
+```Python
+__iter__(self)
+``` 
+
+
+
+### add 
+
+```Python
+adds the item to the list of records
+``` 
+
+
+_parameters:_
+
+- `item:` {SenmlRecord} the item that needs to be added to the pack
+
+
+_returns_: None 
+
+### base_sum 
+
+the base sum of the pack.
+
+
+_returns_: a number 
+
+### base_time 
+
+Get the base time assigned to this pack object.
+While rendering, this value will be subtracted from the value of the records.
+
+
+_returns_: unix time stamp representing the base time 
+
+### base_value 
+
+the base value of the pack. The value of the records will be subtracted by this value during rendering.
+While parsing, this value is added to the value of the records.
+
+
+_returns_: a number 
+
+### clear 
+
+```Python
+clear(self)
+``` 
+clear the list of the pack
+
+
+
+_returns_: None 
+
+### do_actuate 
+
+```Python
+do_actuate(self, raw, naming_map, device=None)
+``` 
+
+called while parsing incoming data for a record that is not yet part of this pack object.
+adds a new record and raises the actuate callback of the pack with the newly created record as argument
+
+_parameters:_
+
+- naming_map:
+- `device:` optional: if the device was not found
+- `raw:` the raw record definition, as found in the json structure. this still has invalid labels.
+
+
+_returns_: None 
+
+### from_cbor 
+
+```Python
+from_cbor(self, data)
+``` 
+
+parse a cbor data byte array to a senml pack structure.
+
+_parameters:_
+
+- `data:` a byte array.
+
+
+_returns_: None 
+
+### from_json 
+
+```Python
+from_json(self, data)
+``` 
+
+parse a json string and convert it to a senml pack structure
+
+_parameters:_
+
+- `data:` a string containing json data.
+
+
+_returns_: None, will call the appropriate callback functions. 
+
+
+
+### remove 
+
+```Python
+remove(self, item)
+``` 
+removes the item from the pack
+
+
+_parameters:_
+
+- `item:` {SenmlRecord} the item that needs to be removed
+
+
+_returns_: None 
+
+### to_cbor 
+
+```Python
+to_cbor(self)
+``` 
+
+render the content of this object to a cbor byte array
+
+
+_returns_: a byte array 
+
+### to_json 
+
+```Python
+to_json(self)
+``` 
+
+render the content of this object to a string.
+
+
+_returns_: a string representing the senml pack object 
+
+## senml_pack.SenmlPackIterator Objects
+
+
+an iterator to walk over all records in a pack 
+
+### __init__ 
+
+```Python
+__init__(self, list)
+``` 
+
+
+
+### __iter__ 
+
+```Python
+__iter__(self)
+``` 
+
+
+
+### __next__ 
+
+```Python
+__next__(self)
+``` 
+
+

micropython/senml/docs/senml_record.md

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+
+# senml_record Module
+
+
+## senml_record.SenmlRecord Objects
+
+
+represents a single value in a senml pack object 
+
+### __enter__ 
+
+```Python
+__enter__(self)
+``` 
+
+for supporting the 'with' statement
+
+
+_returns_: self 
+
+### __exit__ 
+
+```Python
+__exit__(self, exc_type, exc_val, exc_tb)
+``` 
+
+when destroyed in a 'with' statement, make certain that the item is removed from the parent list.
+
+
+_returns_: None 
+
+### __init__ 
+
+```Python
+__init__(self, name, **kwargs)
+``` 
+
+create a new senml record
+
+_parameters:_
+
+- `kwargs:`  optional parameters:
+    - value: the value to store in the record
+    - time: the timestamp to use (when was the value measured)
+    - name: the name of hte record
+    - unit: unit value
+    - sum: sum value
+    - update_time: max time before sensor will provide an updated reading
+    - callback: a callback function taht will be called when actuator data has been found. Expects no params 
+
+### do_actuate 
+
+```Python
+do_actuate(self, raw, naming_map)
+``` 
+
+called when a raw senml record was found for this object. Stores the data and if there is a callback, calls it.
+
+_parameters:_
+
+- `raw:` raw senml object
+
+
+_returns_: None 
+
+### sum 
+
+
+
+### time 
+
+get the time at which the measurement for the record was taken.
+
+
+_returns_: a unix time stamp. This is the absolute value, not adjusted to the base time of the pack. 
+
+### update_time 
+
+get the time at which the next measurement is expected to be taken for this record.
+
+
+_returns_: a unix time stamp. This is the absolute value, not adjusted to the base time of the pack. 
+
+### value 
+
+get the value currently assigned to the object