How to connect ZAP (zap-android) to lnd daemon and get the lndconnect scheme right?

[droid192]

remote node runs debian lnd-linux-amd64-v0.14.3-beta.tar.gz

the scheme zap android asks for
lndconnect://<host>:<port>?[cert=<base64url DER certifcate>&]macaroon=<base64url macaroon> can be qr generated, but what is the host:port? can the node_key.onion be used, how?

the tls.cert and admin.maroon are in the lnd datadir.

[ziggie1984]

yes you can easily connect also your Node which is running behind tor, for zap-android it uses port 10009 (grpc) so it would look something like this:

lndconnect://chjlq27t7igzmv66botvnec7lsic3syg7rkplgxq263wc3vbm4qj5ryd.onion:10009.....

for more infos check this out:

https://github.com/rootzoll/raspiblitz/blob/v1.7/home.admin/config.scripts/bonus.lndconnect.sh#L76

or

https://github.com/LN-Zap/lndconnect/blob/master/lnd_connect_uri.md

[ziggie1984]

not sure which node setup your are running but you also need to create a hidden tor grpc service, so you can connect to it.

Because the above onion address, is the address of my hidden service which is listening on port 10009.

[droid192]

lnd.conf has no (known) option to expose the grpc port on the tor hidden service v3.

thus proceed manually in lnd.conf by #5750

listen=localhost
tor.active=true
tor.streamisolation=true
externalip=lndroutekytme3xds6cmbxaniretdgox2hk4cpu4k27jnub3gkfeuhqd.onion:9735

and edit torrc

HiddenServiceDir /var/lib/tor/lnd
HiddenServicePort 10009 127.0.0.1:10009 # interface for wallet rpc
HiddenServicePort 9735 127.0.0.1:9735 # interface for p2p network

then sudo systemctl restart tor and restart lnd

if you encounter 'problem: Connection failed TLS ALPN negotiation failed with protocols: [h2]' it is due bad mapping 10009 to the lnd announced grpc 127.0.0.1:8080 (which seems logical but errors) instead of to 10009 (rpc).

voila zap connects.