this works:
nc -U /run/snapd.socket <<EOF
PUT /v2/snaps/system/conf HTTP/1.0
Content-Length: 31
{"service.ssh.disable": false}
EOF
this works:
nc -U /run/snapd.socket <<EOF
PUT /v2/snaps/system/conf HTTP/1.0
Content-Length: 31
{"service.ssh.disable": false}
EOF