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Replaced the "not so secure" print and copy function with the securer "n" variants of them.
Removed a for loop for coping byte-by-byte to a string buffer with strncpy and a cast to a char pointer.
Both variants (pure MQTT and MQTT with Home Assistant) need to do the same plausibility check for the incoming message (topic split to more then 2 commands), so not needed to have doubled code.
Fixed a typo in a variable name (subscibeTopic -> subscribeTopic).
Renamed variables from message2 to message.