Success check Read and Write Datapoints

[JHA-2021]

Problem:
Sometimes due to various reasons Datapoints do not exist or are not accessible, for example spelling mistakes etc. make it impossible to read data.
Sometimes writing to DP are not successfull due to various reasons, for example spelling mistakes or inaccessability of other kinds. Especially when writing to Datapoints in modbus means that the forwarding could go wrong. The DP has been written internally correct but after the next datasynch it will fall back to the old state.

To enable a success check if a DP has been read or not it would be great to have a success check built in the blockly element like "else" exists in "if...then"

Regarding the success check of "control" it would be also important to be able to define a delay before the check will be performed.

Example: