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+# Working procedure for testing file transfer with aquatic_ws
+
+- On VPS, create identity (using real certificate), run tracker with TLS
+- On VPS, create torrent with external url as announce. Edit file and put
+  external url not only as announce, but in announce list too.
+- On VPS, disallow traffic to other trackers by adding them to /etc/hosts
+  or maybe with firewall, since webtorrent-hybrid adds its own trackers
+  willy-nilly. To get a list of the tracker urls which are actually used,
+  the node application under heading "Seed application" can be used as a
+  starting point.
+- I opened the listening port in the VPS firewall too (this might not be
+  necessary if running both clients on the VPS, see below)
+- On VPS, run webtorrent-hybrid download --keep-seeding ./abc.torrent
+- On desktop/non-VPS computer, fetch torrent file, run
+  webtorrent-hybrid download ./abc.torrent
+  I actually got it to work running this client on the VPS too.
+
+## Seed application
+
+```js
+// Start webtorrent seeder from data file, create torrent, write it to file,
+// output info
+
+var WebTorrent = require('webtorrent-hybrid')
+var fs = require('fs')
+
+// WebTorrent seems to use same peer id for different
+// clients in some cases (I don't know how)
+peerId = "ae61b6f4a5be4ada48333891512db5e90347d736"
+announceUrl = 'ws://127.0.0.1:3000'
+dataFile = './files-seed/ws-ipv4'
+torrentFile = './torrents/ws-ipv4.torrent'
+
+function createSeeder(){
+    console.log('creating seeder..')
+
+    var seeder = new WebTorrent({ dht: false, webSeeds: false, peerId: peerId })
+    seeder.on('error', function(err) {
+        console.log('seeder error: ' + err)
+    })      
+
+    var addOpts = {
+        announceList: [[announceUrl]],
+        announce: [announceUrl],
+        private: true 
+    }       
+
+    seeder.seed(dataFile, addOpts, function(torrent){
+        console.log("seeding")
+        // Log torrent info, including actually used trackers
+        console.log(torrent) 
+
+        fs.writeFile(torrentFile, torrent.torrentFile, function(err){
+            if (err){
+                console.log(err)
+            }       
+        })      
+
+        torrent.on('warning', function(err){
+            console.log(err)
+        });     
+
+        torrent.on('error', function(err){
+            console.log(err)
+        });     
+
+        torrent.on('download', function(bytes){
+            console.log('downloaded bytes: ' + bytes)
+        });     
+
+        torrent.on('upload', function(bytes){
+            console.log('uploaded bytes: ' + bytes)
+        });     
+
+        torrent.on('wire', function(wire, addr){
+            console.log('connected to peer with addr: ' + addr)
+        });     
+
+        torrent.on('noPeers', function(announceType){
+            console.log('no peers received with announce type: ' + announceType)
+        })      
+
+        torrent.on('done', function(){
+            console.log('done')
+        }); 
+
+    })      
+}
+
+createSeeder()
+```
+
+## Simplifications to procedure that might work
+
+- using fake certificate and routing certificate url to localhost in
+  /etc/hosts, meaning all of this could maybe be run locally/in Docker (but I
+  think sdp negotiations tend to fail in that case..)
+
+## Issues with Docker implementation
+
+- webtorrent-hybrid adds its own trackers when opening torrents, even if they
+  have been removed from file! The really robust way to get around this would
+  be to block all outgoing traffic with e.g. iptables before starting tests,
+  but I couldn't get it to work
+
+## Notes on testing locally
+
+Official tracker does not successfully handle file transfer on localhost
+on my machine between two instances of the official client (webtorrent-hybrid),
+probably due to sdp negotiation issues. This was with plain `ws` protocol.
+
+## Possibly useful collection of commands
+
+```sh
+npm install -g webtorrent-hybrid
+npm install -g bittorrent-tracker # Reference tracker
+
+bittorrent-tracker --ws -p 3000 & # Reference tracker
+
+mkdir files-seed files-leech torrents
+
+webtorrent create files-seed/ws-ipv4 --announce "wss://127.0.0.1:3000" > torrents/ws-ipv4.torrent
+
+cd files-seed
+webtorrent-hybrid seed torrents/ws-ipv4.torrent --keep-seeding -q &
+
+cd ../files-leech
+webtorrent-hybrid download torrents/ws-ipv4.torrent -q &
+```