====== Lua CJSON ======

The [[https://www.kyne.com.au/~mark/software/lua-cjson-manual.html|Lua CJSON]] module provides JSON support for Lua.

Features
  * Fast, standards compliant encoding/parsing routines
  * Full support for JSON with UTF-8, including decoding surrogate pairs
  * Optional run-time support for common exceptions to the JSON specification (infinity, NaN,..)

WebHMI supports this module starting from version WebHMI 3.4.

Documentation for CJSON module is available at [[https://www.kyne.com.au/~mark/software/lua-cjson-manual.html|official site]].

There are 2 most important functions: **cjson.encode** and **cjson.decode**. 

**cjson.encode** will serialise a Lua value into a string containing the JSON representation.

Example:
<code lua>
value = { true, { foo = "bar" } }
json_text = cjson.encode(value)
-- Returns: '[true,{"foo":"bar"}]'
</code>

**cjson.decode** will deserialise any UTF-8 JSON string into a Lua value or table.

Example:
<code lua>
json_text = '[ true, { "foo": "bar" } ]'
value = cjson.decode(json_text)
-- Returns: { true, { foo = "bar" } }
</code>

If your task is extract from the 7bit LoRA AirGate's JSON package then use to following code
<code lua Extract AirGate JSON value>
local encoded = GetReg("encoded_json")

local decoded_table = cjson.decode(encoded)

for i, v in pairs(decoded_table) do 
    TRACE(i .. " = " .. tostring(v)) -- show all the content of packet.
end


temp_int = decoded_table.temp_int -- example of extraction



</code>