Hi David,
'RecvChar' and 'SendChar' can only transfer char type value.
if you want send a string 123.456.7.x, you need convert 123.456.7.x to a string then send them one by one.
then make sure if the data array is converted correct. the ascii code of "123.456.7.x" is:

can this help you?
Have a great day,
Jennie Zhang
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