In Fix message, <SOH> character is used as a delimiter between [tag=value] groups, Is there a problem if I used more than one <SOH> character in the FIX message ?.
i.e:
tag=value<SOH><SOH><SOH>tag=value
8=FIX.4.2<SOH>9=153<SOH>35=D<SOH><SOH><SOH>49=BLP
What you are proposing is not valid FIX.
Sure, some libraries might allow it, but others will (properly) reject it.
Why spend effort doing it wrong? Just do it right.
Or better yet, don't build it at all. Use one of the pre-existing open-source FIX engines that are already trusted by developers worldwide.