MQTT: add JSON payload corresponding to IEC Structured types
- uses https://github.com/cesanta/frozen
- frozen.c is added as a resulting c file in generat_C (fix toolchain_gcc.py as it was breaking dependency checking)
- structured types are converted to C #define, in turn generating json_scanf and json_printf statements
Run PLC code, trace and force variables
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Build
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Transfer
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IDE and runtime must be connected (see :doc:`connect`)