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Well, i think your for loop does not make what you want it to do. With:

str_msg.data = localdata[i];

You will copy one byte (with the given index) into the hole string, which couses the given error, which will be published. Maybe you convert the hole byte-array into an string.

Or you can append one byte after the other to your std_msg.data - string

std_msg.data.append(localdata[i]); // someting like that

and publish the hole string (with your string termination) at once.