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without -level) is well described as

"  * Use VERBOSITY of ifupdown to assist debugging of wpa stanza's in
    /etc/network/interfaces."

With referencte to other paragraph in
/usr/share/doc/wpasupplicant/README.modes.gz

"Another method is to start `wpa_cli -i <interface>` in another shell before
starting the interface. Use the command 'level 0' first, to get all debug
messages sent to the control socket by wpa_supplicant."

I am not sure but could it be level > 0 to get more debug messages?

Thank you for your help.