* Reduced MS/TP MAX_APDU to 480 from 1476 so that devices not use new MS/TP extended frame types which older routers do not understand.
* Added extra objects to STM32F4xx example to elicit edge cases in object-list for testing.
* Create common DLMSTP using core MSTP FSM in STM32F4xx example
* add openocd debug launcher under vscode in STM32F4xx example
* Add generic property list member checking for write property members of network port object in STM32F4xx example