Fix issue-701 for S7 driver. #770
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Hello,
This PR fixes the binary writing problem on S7 drivers.
The problem originated in the use of padding in the "S7VarPayloadDataItem" type.
The last Item associated with a writing process does not require the use of padding, so it must be considered in the "S7ProtocolLogic".
Likewise, a static method "PADCOUNT" is added, to add or not the padding depending on the "hasNext" flag.
Tests have been carried out and no other processes of the S7 driver are affected.