Fix JSON object termination
Fix JSON object termination

 - Replace '{' with 0xFF
 - Require member id < 0xFF
 - Previous verson had overlap with member ID

Signed-off-by: David Oberhollenzer <ef97309e490485c1bad5018f0617d7fa37bc07ac@tele2.at>

AgentD/websrv,AgentD/websrv,AgentD/websrv