Configuration

The default settings are in the core library's conf.js file, they can be overridden in your project root's conf.js and then in conf.json in the app data folder. The app data folder is:
macOS: ~/Library/Application Support/<appname>
Linux: ~/.config/<appname>
Windows: %LOCALAPPDATA%\<appname>
<appname> is name in your package.json, e.g. headless-obyte.
Database location
At some point you'll surely want to have a peek into the database, or even make a modification in it. Default SQLite database file and RocksDB folder are located near the config file, you can find the correct paths for each platform above.
Testnet network
Most bot repositories have example .env.testnet file in their root folder. In order to connect use testnet network, just run cp .env.testnet .env. Backup and delete the database if you already ran it on MAINNET. Wallet app for TESTNET can be downloaded from Obyte.org website.
If you don't have .env.testnet example file then just create a .env file that contains this row:
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testnet=1
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Settings
This is the list of some of the settings that the library understands (your app can add more settings that only your app understands):
conf.port
The port to listen on. If you don't want to accept incoming connections at all, set port to null, which is the default. If you do want to listen, you will usually have a proxy, such as nginx, accept websocket connections on standard port 443 and forward them to your Obyte daemon that listens on port 6611 on the local interface.
conf.storage
Storage backend -- mysql or sqlite, the default is sqlite. If sqlite, the database files are stored in the app data folder. If mysql, you need to also initialize the database with initial .sql file and set connection params:
conf.json
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{
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    "storage": "mysql",
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    "database": {
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        "host"     : "localhost",
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        "user"     : "DATABASE_USER",
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        "password" : "DATABASE_PASSWORD",
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        "name"     : "DATABASE_NAME"
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    }
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}
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MySQL conf for faster syncing
To lower disk load and increase sync speed, you can optionally disable flushing to disk every transaction, instead doing it once a second. This can be done by setting innodb_flush_log_at_trx_commit=0 in your MySQL server config file (my.ini)
conf.bLight
Work as light node (true) or full node (false). The default is full client. Light node only holds data that is relevant to your wallet, full node sync all the data in public database. Benefit of light node is that you can start using it immediately, but the downside is that you might not get updates about new transactions and confirmations as fast as full node does.
conf.bServeAsHub
Whether to serve as hub on the Obyte network (store and forward e2e-encrypted messages for devices that connect to your hub). The default is false.
conf.myUrl
If your node accepts incoming connections, this is its URL. The node will share this URL with all its outgoing peers so that they can reconnect in any direction in the future. By default the node doesn't share its URL even if it accepts connections.
conf.bWantNewPeers
Whether your node wants to learn about new peers from its current peers (true, the default) or not (false). Set it to false to run your node in stealth mode so that only trusted peers can see its IP address (e.g. if you have online wallets on your server and don't want potential attackers to learn its IP).
conf.socksHost, conf.socksPort, and conf.socksLocalDNS
Settings for connecting through optional SOCKS5 proxy. Use them to connect through TOR and hide your IP address from peers even when making outgoing connections. This is useful and highly recommended when you are running an online wallet on your server and want to make it harder for potential attackers to learn the IP address of the target to attack. Set socksLocalDNS to false to route DNS queries through TOR as well.
Email notifications
Most bots out there expect user's machine to have UNIX sendmail and by default sendmail function in mail module will try to use that, but it is possible to configure your node to use SMTP relay. This way you could use Gmail or Sendmail SMTP server or even something like Mailtrap.io (excellent for testing purposes if you don't want the actual email recipient to receive your test messages). This is how the configuration would look:
conf.json
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{
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    "smtpTransport": "relay",
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    "smtpRelay": "smtp.mailtrap.io",
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    "smtpUser": "MAILTRAP_INBOX_USER",
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    "smtpPassword": "MAILTRAP_INBOX_PASSWORD",
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    "smtpSsl": false,
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    "smtpPort": 2525,
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    "admin_email": "[email protected]",
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    "from_email": "[email protected]"
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}
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smtpTransport can take one of three values:
local: send email using locally installed sendmail. Normally, sendmail is not installed by default and when installed, it needs to be properly configured to actually send emails. If you choose this option, no other conf settings are required for email. This is the default option.
direct: send email by connecting directly to the recipient's SMTP server. This option is not recommended.
relay: send email through a relay server, like most email apps do. You need to also configure the server's host smtpRelay, its port smtpPort if it differs from the default port 25, and smtpUser and smtpPassword for authentication to the server.
Accepting incoming connections
Obyte network works over secure WebSocket protocol wss://. To accept incoming connections, you'll need a valid TLS certificate (you can get a free one from letsencrypt.org) and a domain name (you can get a free domain from Freenom). Then you accept connections on standard port 443 and proxy them to your locally running Obyte daemon.
This is an example configuration for nginx to accept websocket connections at wss://obyte.one/bb and forward them to locally running daemon that listens on port 6611:
If your server doesn't support IPv6, comment or delete the two lines containing [::] or nginx won't start
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server {
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    listen 80 default_server;
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    listen [::]:80 default_server;
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    listen 443 ssl;
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    listen [::]:443 ssl;
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    ssl_certificate "/etc/letsencrypt/live/obyte.one/fullchain.pem";
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    ssl_certificate_key "/etc/letsencrypt/live/obyte.one/privkey.pem";
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​
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    if ($host != "obyte.one") {
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        rewrite ^(.*)$ https://obyte.one$1 permanent;
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    }
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    if ($https != "on") {
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        rewrite ^(.*)$ https://obyte.one$1 permanent;
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    }
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​
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    location = /bb {
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        proxy_pass http://localhost:6611;
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        proxy_http_version 1.1;
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        proxy_set_header X-Real-IP $remote_addr;
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        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
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        proxy_set_header Upgrade $http_upgrade;
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        proxy_set_header Connection "upgrade";
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    }
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​
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    root /var/www/html;
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    server_name _;
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}
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By default Node limits itself to 1.76GB the RAM it uses. If you accept incoming connections, you will likely reach this limit and get this error after some time:
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FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed - JavaScript heap out of memory
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1: node::Abort() [node]
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...
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...
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12: 0x3c0f805c7567
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Out of memory
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To prevent this, increase the RAM limit by adding --max_old_space_size=<size> to the launch command where size is the amount in MB you want to allocate.
For example --max-old-space-size=4096, if your server has at least 4GB available.
Checking if the node is running
Sending the notification to admin when node stops
Many bots have a file named check_daemon.js included in the repository, which looks like this
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const check_daemon = require('ocore/check_daemon.js');
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check_daemon.checkDaemonAndNotify('node start.js');
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This can be executed with crontab with the command mentioned in crontab.txt and when the email is properly configured on the server and the node crashes, this script will notify you that the node went down.
If you are executing your node with node start.js --max-old-space-size=4096 command then you should also change the checkDaemonAndNotify parameter.
Restarting the node automatically when it stops
If you are running a wallet-less node (Hub, Relay or Explorer) or password-less headless wallet (conf.bNoPassphrase=true) then you can restart the node automatically when it stops. In order to do that, you could use checkDaemonAndRestart function, instead of checkDaemonAndNotify.
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const check_daemon = require('ocore/check_daemon.js');
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check_daemon.checkDaemonAndRestart('node start.js', 'node start.js 1>log 2>>err');
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The first parameter in checkDaemonAndRestart is the process that gets searched from ps x command response, the second parameter is a command that will get executed when node has stopped.
Above example is for wallet-less node, which will log the stdout and stderr  (>> for appending) to file (headless wallet has logging built-in). If the command uses parameters like --max-old-space-size=4096 then these should be added to both parameters, but output directing (1>log and 2>>err) should not be added to first parameter.
If you are using NVM to manage your Node.js versions then you might need to add PATH and LD_LIBRARY_PATH to your crontab configuration as well, otherwise crontab might not be able to restart the node.