Pay a lightning invoice over goTenna mesh network

Terms:

• MESH -- the off-grid machine. Has a copy of C-Lightning installed, a Blockstream satellite connection for blockchain backend, and will relay C-Lightning messages for a single channel, over mesh network.

• GATEWAY -- has a connection to goTenna mesh network and also internet. Does not require any C-Lightning or Bitcoin blockchain capability but will act as a relay/proxy for MESH.

• REMOTE -- the remote channel counterpaty for the lightning channel MESH has open, not GATEWAY! Has C-Lightning running only.

Optional but recommended C-Lightning config options:

# listen but don't announce
bind-addr=0.0.0.0:9733
# disable dns lookup of peers
disable-dns
# see wire messages
log-level=io

1. C-Lightning setup:

   1. REMOTE must be at commit v0.7.3rc2

   2. MESH works best with additional patches, found in this fork: v0.7.3rc2_mesh

   git clone https://github.com/willcl-ark/lightningtenna.git
   git checkout v0.7.3rc2_mesh
   

2. Both instances of C-Lightning should be configured using "--enable-developer" flag in order to permit the "lightning-cli dev-suppress-gossip" command:

   ./configure --enable-developer

3. Make C-Lightning

   make

4. Before first start, modify the values in example_config.ini as appropriate.

5. MESH should ideally have a single peer and single channel open in C-Lightning.

6. On MESH, ensure C-Lightning is not running.

7. On REMOTE start C-Lightning. Issue RPC command:

   lightning-cli dev-suppress-gossip

8. On MESH, start the python mesh client: python lightningtenna.py --mesh, follow the prompts, then power on goTenna (a) and await connection messages.

9. On GATEWAY (can be same machine for testing) start the gateway client python lightningtenna.py --gatway, power on goTenna (b) and await connection messages.

10. On MESH start C-Lightning.

11. Watch them communicate via mesh network proxy.

12. Pay an invoice. If testing, you can use python testpay.py to grab a testnet blockstream satellite invoice and try to pay it using Lighting-rpc.