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Multiple problems with this (and similar) lines:
if (inByte = 'F3 251 2 11 1001')
First, the "=" symbol assigns, not compares. You want "==".
Second, 'F3 251 2 11 1001' is not a multi-byte string. You want double quotes, eg. "F3 251 2 11 1001".
Third, that string won't fit into inByte which is only one byte.
Fourth, you don't compare strings like that (use strcmp instead) unless you use the String class, which itself is not recommended.