Another way to enable external runtime parse tool such as hcidump is to enable BTSNOOP_EXT_PARSER_INCLUDED.
See hci/include/bt_hci_bdroid.h, by default the debugging port is port 4330.
==== Log tool ====
See [https://github.com/eric30/bluedroid-log-tool]
* togglelog.sh: Enable/Disable bluedroid log
* openlog.sh: Download bluedroid log and use wireshark to check
== Gecko support ==