This is not surprising. The limit is there because of the QR version that is implemented.
How many bytes do you need?
My trial string length is 136,
so about 150 needed due to variable security code length.
Trying to do this without linking to a 3'rd party website due to possible volume issues and lack of continuity. Also the importance of it being available offline.
Tried to do a link to a perl script on my own backend as a temporary measure,
but my contracted hosting site (shared) do not have any perl barcode modules loaded on the servers, or the possibility for this.