bird BGP debug issue

Classified as: {OPEN} I configured BGP with peer, which is Fortinet device. Both of sides show BGP status established, however, there is no route exchanged. Start bird daemon with -D log_file, but only see some keepalive, no other debug message come out. 1. Is it possible to increase debug level, see more logs to figure out the root cause ? 2. Generally how to debug this kind of BGP issue, any suggestion is appreciated ? {OPEN}