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--- venus-os:large [2022-09-12 21:43] – [1.1 Venus OS Large, Node-RED and Signal K server?] mvader
+++ venus-os:large [2024-05-02 00:04] (current) – [6.2 Documentation and support for Signal K] mvader
@@ Line 5: / Line 5: @@
 This manual documents Venus OS Large. Venus OS is the the software running on our [[https://www.victronenergy.com/panel-systems-remote-monitoring/cerbo-gx|Cerbo GX monitoring device]] as well as other GX devices. Venus OS Large is an extended version of the common software, adding [[https://nodered.org/|Node-RED]] and [[https://www.npmjs.com/package/signalk-server|Signal K server]].
-**Node-RED** offers PLC like programming for connecting hardware devices, APIs and online services.It provides a browser-based editor that makes it easy to wire together flows. With it, one can for example program a functionality such as activating a relay based on a temperature measurement. Or make far more complex algorithms, tying relays, measurements, or other data available from Venus OS or elsewhere together. All without having to write real source code, as Node-RED calls Low-code programming for event-driven applications.
+**Node-RED** offers PLC like programming for connecting hardware devices, APIs and online services. It provides a browser-based editor that makes it easy to wire together flows. With it, one can for example program a functionality such as activating a relay based on a temperature measurement combined with time. Or make far more complex algorithms, tying relays, measurements, or other data available from Venus OS or elsewhere together. All without having to write real source code. Node-RED is also called Low-code programming for event-driven applications.
 Also Node-RED features a [[https://flows.nodered.org/node/node-red-dashboard|fully customisable dashboard]], viewable in a webbrowser - both locally but also remotely, via the VRM Servers.
+To get a good idea of its possibilities, see our [[https://github.com/victronenergy/node-red-contrib-victron/wiki/Example-Flows|example flows]].
-**Signal K server** is aimed for yachts, and multiplexes data from NMEA0183, NMEA 2000, Signal K and other sensor inputs. It makes all that data available for Apps, such as [[https://www.wilhelmsk.com/|WilhelmSK]], a highly customizable boat instrument display. The [[https://www.victronenergy.com/blog/2019/06/13/sailing-with-signal-k/|Sailing with Signal K blogpost on our website]] is a great read for more information and ideas.
+**Signal K server** Signal K Server is a server application that runs on a central hub in a boat; in this case a Victron GX device. A few of its most used features are:
+  - WiFi navigation and AIS data server to charting apps such as iSailor, Navionics, iNavX, Aqua Map.
+  - The perfect Anchor alarm, for features and details see [[https://demo.signalk.org/documentation/features/anchoralarm/anchoralarm.html|Signal K docs -> Anchor alarm]].
+  - Automatic log book
+  - Serve full featured marine instrumentation package such as the iOS [[https://www.wilhelmsk.com/|WilhelmSK App]] or [[https://github.com/mxtommy/Kip#readme|KIP]].
+The [[https://demo.signalk.org/documentation/|the official Signal K documentation]] provides more information about Signal K itself. Note that many of the information about how to install Signal K does not apply: it comes pre-installed on the Victron GX devices when installing Venus OS Large.
+For more information on Signal K on Venus OS, see below chapter.
@@ Line 19: / Line 28: @@
 There is and will be no official support on the functionalities of Venus OS large.
-For support, turn to the [[https://community.victronenergy.com/spaces/31/index.html|Modifications Space on Victron Community]].
+For support, turn to the [[https://community.victronenergy.com/spaces/31/index.html|Modifications Space on Victron Community]] and/or the [[https://community.victronenergy.com/smart-spaces/71/node-red.html|Node-RED Space on Victron Community]].
-There, first search if someone else had a similar question already. And if you can’t find such, then create a new question.
+There, first search if someone else had a similar question already. And if you can’t find such, then create a new question. Make sure you add Node-RED to the topic.
 For support on SignalK, there is a #victron channel in [[http://slack-invite.signalk.org/|the SignalK Slack]] workspace.
@@ Line 30: / Line 39: @@
 The compatible GX devices are:
+  * Ekrano GX
   * Cerbo GX
+  * Cerbo-S GX
   * Venus GX
   * Octo GX
@@ Line 43: / Line 54: @@
 ==== 3.2 CPU & Memory resources ====
-Both SignalK as well as Node-red are rather resource intensive software applications to run on the GX Device. From a CPU usage point of view as well as RAM memory.
+Both SignalK as well as Node-RED are rather resource intensive software applications to run on the GX Device. From a CPU usage point of view as well as RAM memory.
 Ofcourse, how intensive depends on what kind of flows (node-red) or how many messages & handling of them (SignalK) happens in the system.
@@ Line 79: / Line 90: @@
   - Verify that the image was successfully installed: go to the Settings menu, and check that the Venus OS Large menu is available.
-  - Enable either Signal K or Node-RED. Note that though its possible to enable both, doing that on a Venus GX is "pushing it", the system might become slow. This is less of a problem on a Cerbo GX, as it has more resources. Installer access level is required to enable/disable these settings.
+  - Enable either Signal K or Node-RED. Note that though its possible to enable both, doing that on a Venus GX is "pushing it", the system might become slow. This is less of a problem on a Cerbo GX, as it has more resources (faster CPU). Installer access level is required to enable/disable these settings.
 Visible once successfully installed, the Venus OS Large menu:
@@ Line 116: / Line 127: @@
 Also Node-RED features a [[https://flows.nodered.org/node/node-red-dashboard|fully customisable dashboard]], viewable in a webbrowser - both locally but also remotely, via the VRM Servers.
-A good tutorial on how to work with Node-RED is here: https://nodered.org/docs/tutorials/first-flow. On https://github.com/victronenergy/node-red-contrib-victron/wiki/Example-Flows you can find example flows that use the Victron Energy nodes.
+A good tutorial on how to work with Node-RED is here: https://nodered.org/docs/tutorials/first-flow. On https://github.com/victronenergy/node-red-contrib-victron/wiki/Example-Flows you can find example flows that use the Victron Energy nodes. Searching for [[https://flows.nodered.org/search?term=victron|Victron]] on [[https://flows.nodered.org/search?term=victron|https://flows.nodered.org/]] will give all community flows that have been tagged "victron".
+==== 5.2 Three part introductory webinar ====
+This is a 3 part introductory webinar on Node-RED and Venus available at the Victron Tech YouTube channel:
+[[https://www.youtube.com/watch?v=i_iaciqn_Fg| 1. Getting started]]
+ {{youtube>i_iaciqn_Fg?medium}}
+[[https://www.youtube.com/watch?v=_J2rVNLrDIg| 2. Basic building blocks and the dashboard]]
+ {{youtube>_J2rVNLrDIg?medium}}
+[[https://www.youtube.com/watch?v=8ceMtBo3orM| 3. Complex flows and dashboard example]]
+ {{youtube>8ceMtBo3orM?medium}}
 The Node-RED editor can be accessed from your LAN at https://venus.local:1881/. For some systems, you'll have to replace ''venus.local'' by the ip-address. You can also access the Node-RED editor from VRM, where it is available via the //Venus OS Large// menu.
-__Standard nodes + Victron nodes__
+==== 5.3 Node specifications ====
 Node-RED comes with a core set of useful nodes, and within the Venus OS large install there is a set of Victron nodes added to that: the Victron Pallet. All of the different nodes are described [[https://github.com/victronenergy/node-red-contrib-victron/wiki/Available-nodes|here]].
 For developers: source code for the node-red-contrib-victron modules is [[https://github.com/victronenergy/node-red-contrib-victron/|here]], and note that updating is not possible from either the Node-RED editor as the commandline. The recommended way to get to the new node-red-contrib-victron version is to await a new Venus OS large build.
 ==== 5.2 Back-up and restore ====
@@ Line 185: / Line 211: @@
 === Charger relays ===
-The only charger which has a relay that is controllable is the Phoenix Smart Charger. To use that for remote control, set its mode, using the VictronConnect app, to be remote controllable. Note that its use is limited: the relay is only powered (and thus only controllable) when the charger is switched on. It doesn't work when it's turned off with AC connected. This limitation applies to the 230V models as well as the later 120V/240V models.
+The only charger which has a relay that is controllable is the Smart IP43 Charger. To use that for remote control, set its mode, using the VictronConnect app, to be remote controllable. Note that its use is limited: the relay is only powered (and thus only controllable) when the charger is switched on. It doesn't work when it's turned off with AC connected. This limitation applies to the 230V models as well as the later 120V/240V models.
 ==== 5.5 Node-RED Dashboard ====
@@ Line 192: / Line 218: @@
 It is viewable in a web browser - both locally as well as remote, via the VRM Servers. See chapter 6.2 for how to see it remotely.
-The dashboard needs to be installed, just like other extra palettes, using the Manage Palette feature, on the right of the screen in the menus.
+The [[https://flows.nodered.org/node/node-red-dashboard|dashboard]] needs to be installed, just like other extra palettes, using the Manage Palette feature, on the right of the screen in the menus.
-Once that is done, you can find the nodes in the palettes on the left.
+Once that is done, you can find the nodes in the palettes on the left. Once the dashboard has been configured and deployed, an extra tile will appear in the //Venus OS Large// menu on VRM, allowing to connect to the dashboard via VRM.
 Example dashboard:
@@ Line 208: / Line 234: @@
   -  ''/usr/lib/node_modules/node-red/venus-settings.js'' is read first. Never change this file as it will be overwritten by a Venus OS update.
   -  ''/data/home/nodered/.node-red/settings-venus.js'' is used to override and/or extend the first file and will survive Venus OS updates. Do not edit this file as this is for Victron to use.
   -  ''/data/home/nodered/.node-red/settings-user.js'' is used to override and/or extend the second file and will survive Venus OS updates. You are allowed to edit this file if you please, but don't be too surprised if that causes Node-RED to break after an upgrade.
+When using these files, make sure that the configuration is enclosed within a ''module.exports = {}'' block.
 There are more configuration files in ''/data/home/nodered/.node-red/''. You might not have all of them on your system or even some more if you installed one or more of our candidate releases.
@@ Line 217: / Line 244: @@
 For more information on such Node-RED configuration customisations, see https://nodered.org/docs/user-guide/runtime/configuration.
-==== 5.7. Node-RED FAQ ====
+==== 5.7. Ready-to-use solutions ====
-=== Q: Write/read file gives "Error: EACCESS: permission denied' ===
+Node-RED can also be used for doing more advanced tasks. Some examples of ready-to-use solutions are:
+  * [[https://flows.nodered.org/node/victron-dynamic-ess|Dynamic ESS]] - fetch the ideal ESS setpoint from VRM based on dynamic energy prices and predicted solar forecast
+  * [[https://flows.nodered.org/node/node-red-contrib-eskomsepush|EskomSePush]] - use Node-RED for charging the batteries before the next load shedding happens (for South African users)
+==== 5.8. Using data from VRM  ====
+For some flows it can be useful to retrieve data from the VRM Portal Database. For example to retrieve de Solar irradiation or yield forecasts.
+To access data from the VRM API, a VRM access token is needed. This is done by going to the [[https://vrm.victronenergy.com/access-tokens|access token]] part of VRM and add a new token. Once generated, store the access token in your password vault as you won't be able to retrieve it again.
+{{ :venus-os:generate-access-token.png?nolink&600 |}}
+Thereafter, that token can be used to retrieve data from the VRM Portal API.
+Full portal API documentation is here: https://vrm-api-docs.victronenergy.com/#/.
+To, for example, retrieve Solar Irradiation forecasts, see the [[https://vrm-api-docs.victronenergy.com/#/operations/installations/idSite/stats|stats call]], and then one of these attributes:
+	vrm_pv_inverter_yield_fc	7	PV Inverter - Yield Forecast
+	vrm_pv_charger_yield_fc	4	Solar Charger - Yield Forecast
+	vrm_solar_irradiance_fc	0	Solar Irradiance Forecast
+	vrm_solar_irradiance	0	Solar Irradiance
+Note that there could be more relevant attributes, see VRM documentation for that.
+{{ :venus-os:vrm-api-flow.png?nolink&600 |}}
+The [[https://flows.nodered.org/node/victron-vrm-api|Victron VRM API node]] makes it easy to use the VRM API from a Node-RED flow. Alternatively take a look at above mentioned Dynamic-ESS flow.
+==== 5.9. Node-RED FAQ ====
+=== Q1: Write/read file gives "Error: EACCESS: permission denied' ===
 Since Venus OS 2.90 and on wards, Node-RED no longer runs as user ''root'', but as user ''nodered''. This means that the Node-RED flows are only allowed to access files and directories that are owned by the ''nodered'' user. These files typically start below ''/data/home/nodered/''. So modifying the storage location to something like ''/data/home/nodered/storage.txt'' ought to work.
-=== Q: How can I update the Victron node pallette ===
+=== Q2: How can I update the Victron node pallette ===
 As that pallette is part of the total Venus OS large package, it can only be updated by installing a newer Venus OS large version.
@@ Line 229: / Line 287: @@
 In case you see that there is a newer version Victron pallette available online, and thats not yet shipping in a Venus OS Large version, then the only option is to wait: a new Venus OS Large version is usually made available shortly after updating that pallette.
-=== Q: How can I password protect Node-RED ===
+=== Q3: How can I password protect Node-RED ===
 Password protection of Node-Red is linked to the remote console. If a password is set for the remote console, this password is also used for securing Node-Red. The username is ''admin'', the password is the remote console password.
-=== Q: How do I restart Node-RED from the Venus GUI? ===
+=== Q4: How do I restart Node-RED from the Venus GUI? ===
 In order to restart Node-RED you need to disable and enable it from the menu. You can find this under //Venus OS Large Features -> Node-RED//.
-=== Q: How does safe mode work and what is it? ===
+=== Q5: How does safe mode work and what is it? ===
 From the Venus GUI you can select Node-RED to be enabled in "safe mode". This means that Node-RED will start without starting the flows. This allows you to open the flows in the editor and make changes without the flows running. When you deploy your changes, the flows are then started. The safe mode can be handy if one of the flows has an error that causes high CPU loads on the Venus device or other issues.
-=== Q: Can I install the @signalk/node-red-embedded? ===
+=== Q6: Can I install the @signalk/node-red-embedded? ===
 No, at least not into the node-red instance which comes as part of Venus OS Large. To @signalk/node-red-embedded, we recommend to use the node-red plugin/instance that can optionally be installed into signalk:
@@ Line 249: / Line 307: @@
   - install the Victron pallette into the Node-RED thats part of SignalK server
-=== Q: I get the error: Failed to remove, unrecognised module ===
+=== Q7: I get the error: Failed to remove, unrecognised module ===
 This is seen when trying to remove a module that has been previously uninstalled, but left some files behind. After which Node-RED is incapable of completely removing the module. This is probably a remnant of upgrading an old version of Node-RED to a newer. What we've seen is that the module is still on the disk, but Node-RED no longer is aware of it in its configuration. The way to recover from this is to add the module to the Node-RED configuration again. This can be done by performing the following steps:
@@ Line 261: / Line 319: @@
 After following these steps Node-RED should know about the module again and you should be able to remove or upgrade it.
-=== Q: The browser complains about non private connection ===
+=== Q8: The browser complains about non private connection ===
 Node-RED on Venus now uses SSL for its connection. As the certificate is signed by a "self signed certificate", your browser is unable to trust the connection and throw a warning ("Your connection is not private" or something similar). In order to proceed, you need to press the "Advanced" or "Show Details" button and then click to visit the website. Some browsers will still display 'Not secure' and claim that the Certificate is invalid, but that is inherent to self-signed certificates. The benefit is that usernames and passwords no longer travel in clear text over the network.
 Another implication might be that you need to prepend the connection with ''https'' instead of ''http'' and change the port from ''1880'' to ''1881''. So you should connect to ''https://venus.local:1881/'' for Node-RED. If your browser still wants to connect to the old http way, you may get an ''ERR_EMPTY_RESPONSE''. Adjust the url in your browser to connect to the https site instead.
+Finally, if you want to use the Node-RED command line interface for administration, you will run into the ''Error: self signed certificate'' error. This can be solved by setting the ''NODE_EXTRA_CA_CERTS '' environment variable to ''/data/etc/ssl/venus.local.crt'' like so:
+  export NODE_EXTRA_CA_CERTS=/data/etc/ssl/venus.local.crt
+=== Q9: How often do the Victron input nodes send a msg? ===
+The input nodes send out a message on each value change. If the ‘//only changes//’ checkbox is set, this will be the only output of the node. If the '//only changes//' checkbox is not set, the node also sends out the current value each 5 seconds. If you want more fine grained control, consider storing the desired values in a context in combination with triggered intervals. See [[https://github.com/victronenergy/node-red-contrib-victron/wiki/Example-Flows#only-messages-at-regular-intervals|here]] for an example on how to do that.
+=== Q10: How can I get Node-RED to also listen to http port 1880 ===
+There are some nodes that are only able to connect to a http site. In that case you probably also want to enable http on port 1880. This can be achieved by creating (or adding to) a user configuration file ''/data/home/nodered/.node-red/settings-user.js'', containing:
+  module.exports = {
+     /* Make sure that we also listen on port 1880 on all interfaces */
+     uiHost: "::"
+  }
+And restart Node-RED.
 ===== 6. Signal K =====
@@ Line 272: / Line 349: @@
 === 6.1.1 Why have Signal K on your GX Device? ===
-By adding Signal K, the GX device becomes a data hub for all marine electronics on your yacht. For example audio, boat speed and wind data, and more. The Signal K is the interface between all those devices and protocols on one side, and mobile Apps on phones, tablets and the alikes on the other. Note that SignalK itself is not a visualisation tool, its purpose is purely to gather all the data and make it available for web- phone-, and tablet-apps for the visualisation.
+By adding Signal K, the GX device becomes a data hub for all marine electronics on your yacht. For example AIS, boat speed and wind data, and more. The Signal K is the interface between all those devices and protocols on one side, and mobile Apps on phones, tablets and the alikes on the other. Note that SignalK itself is not a visualisation tool, its purpose is purely to gather all the data and make it available for web- phone-, and tablet-apps for the visualisation.
 Also, there are SignalK plugins to forward the data to influxdb & Grafana.
@@ Line 278: / Line 355: @@
 Popular Apps compatible with Signal K:
+  * Auqua Map
+  * iNavX
+  * iSailor
+  * Navionics
   * [[https://www.wilhelmsk.com/|Wilhelm SK]] - WilhelmSK is a highly customizable boat instrument display available for  iPhone, iPad, Apple Watch and AppleTV.
   * ... (welcome to add more here)
@@ Line 295: / Line 376: @@
 Signalk-server is a software application that, in the context of this manual, runs on your GX Device and interface to all Victron protocols and more. It uses plugins, and there is a large community of enthusiasts around it, making it one of the most flexible and complete pieces of software that understands the plethora of protocols of all different manufacturers that make marine electronics.
-For more information on Signal K, read [[http://signalk.org/overview.html|the Signal K website]]. And our blog post of a while ago.
+For more information on Signal K, read the [[https://github.com/SignalK/signalk-server/blob/master/README.md|the Signal K Server readme]].
 Note that Signal K is not a Victron project. At Victron, we are great fans of sailing, open source as well as community driven projects. And Signal K is a perfect example of such project. And when running on a GX Device its a perfect marriage.
-=== 6.1.4 Signal K - the data format ===
-Strictly speaking, Signal K is not software but a data format. And Signalk-server is the name of the software.
-This section explains the rationale behind the data format.
-Signal K is a modern and open data format for marine use. Its goal is to
-- create a shared data model for marine related data
-- make marine related data easy to access, handle and build applications on
-The shared data model allows you to handle the data in a uniform way independent of how the data is produced. In practice this means that you can refer to your battery voltage with `electrical/batteries/1/voltage` and not care where data came from: Victron BMV, NMEA 2000 bus or some other voltage sensor.
-Easy access means that you can use modern standards like HTTP, WebSockets and JSON that are in widespread. There is a wealth of knowledge and skilled people are easy to find, with no special marine related knowledge needed to get started.
-In Venus OS it brings all the data available in the GX system, including NMEA 2000 data, to a single data model and programming interface.
 === 6.1.3 Considerations on how to install Signal K ===
-The type of install described in this document, running Venus OS including SignalK, has these advantages: TODO elaborate. Doing this was born out of a wish to make SignalK more mainstream, less of a rapsberrypi / hobbieists/tinkerers product.
+The type of install described in this document, running Venus OS including SignalK, has these advantages: no need to use a rapsberrypi, all ready in one box; no special firmware updates or commandline knowledge needed to maintain or update it. Doing this was born out of a wish to make Signal K Server (also) available to the more mainstream users.
-The other common type of SignalK install, installed on a RaspberryPi running Raspbian, has the advantages of more flexibility, and ease of installing extra components such as Grafana or Influx. The disadvantage is that you are basically setting up a Linux computer yourself, which you’ll also have to maintain yourself. Whereas the Venus OS type is more of a complete product; no need to bother about keeping individual components up to date and worrying about their compatibility.
+The other common type of Signal K Server install, installed on a RaspberryPi running Raspbian, has the advantages of more flexibility, and ease of installing extra components such as Grafana or Influx. The disadvantage is that you are basically setting up a Linux computer yourself, which you’ll also have to maintain yourself. Whereas the Venus OS type is more of a complete product; no need to bother about keeping individual components up to date and worrying about their compatibility.
 There is no one right way for everyone to do this; the best solution will depend on the requirement.
-For raspberrypi owners, note that its very easy to try both methods and change between them: simply have two sdcards.
+For raspberrypi owners, note that its very easy to try both methods and switch between them: simply have two sdcards.
-==== 6.2 Where to find support? ====
+==== 6.2 Documentation and support for Signal K ====
-As above already introduced, use [[https://community.victronenergy.com/search.html?c=&includeChildren=&f=&type=question+OR+idea+OR+kbentry+OR+answer+OR+topic+OR+user&redirect=search%2Fsearch&sort=relevance&q=signal+k|the Modifications space on Victron Community]]. As an extra, for Signal K we recommend the Victron channel in the [[http://slack-invite.signalk.org/|SignalK Slack]].
+  * [[https://demo.signalk.org/documentation/|The official Signal K documentation]]
+  * [[https://community.victronenergy.com/search.html?c=&includeChildren=&f=&type=question+OR+idea+OR+kbentry+OR+answer+OR+topic+OR+user&redirect=search%2Fsearch&sort=relevance&q=signal+k|Signal K topics on the Victron Community forum]]
+  * [[https://discord.gg/uuZrwz4dCS |Signal K Discord]] - a real time chat group including a special Victron channel.
 Do not contact normal Victron support for any help on SignalK. Its based on community support, not official support.
-==== 6.4 First use & configuring ====
+==== 6.3 First use & configuring ====
 === Step 1. Opening the dashboard ===
@@ Line 351: / Line 417: @@
 === Step 3. Configure can-bus connections ===
-For the Venus GX, SignalK comes pre-configured with a NMEA2000 listener for the VE.Can ports, its named "n2k-on-ve.can-socket", and uses the canboatjs.
+For the Venus GX, and Cerbo GX, SignalK comes pre-configured with a NMEA2000 listener for the VE.Can ports, its named "n2k-on-ve.can-socket", and uses the canboatjs. Here is how you can see the same in the Signal K Admin UI:
 ;#;
 {{:venus-os:cerbo-gx-signalk-canboatjs.png?400|}}
 ;#;
 Note that, to keep that operational, that port must be configured as a 250kbit VE.Can & NMEA2000 port in the Remote Console.
@@ Line 364: / Line 429: @@
 ;#;
+For more information on CAN-busses, see chapter 6.4.
 === Step 4. Adding Signalk Plugins or Webapps ===
@@ Line 369: / Line 435: @@
 TODO: explain & warn about data partition size & space (since thats where plugins are installed by signalk on Venus OS). Filling up the datapartition can corrupt Venus OS. More information about data partition on Venus OS here: https://github.com/victronenergy/venus/wiki/data-partition
+==== 6.4 CAN-bus ports ====
+Below lists documents the mapping from physical ports on the device to the interface within Venus OS. This information is needed when you want to deviate from the standard configuration.
+=== Cerbo GX ===
+^ Enclosure label ^ Interface ^ Notes ^
+| VE.Can 1 | can0 | Non-isolated and default enabled in SignalK |
+| BMS-Can | can1 | Non-isolated, not usable within SignalK for NMEA2000 |
+Within the Victron product range, CAN-bus ports that are labelled BMS-Can are limited in their functionality due to hardware constraints. Their only use is to connect to a managed battery such as BYD and Pylontech, used in landbased ESS & Off-grid systems - not in the marine market.
+=== Cerbo GX MK2 ===
+^ Enclosure label ^ Interface ^ Notes ^
+| VE.Can 1 | can0 | Isolated and default enabled in SignalK |
+| VE.Can 2 | can1 | Non-isolated |
+=== Ekrano GX ===
+^ Enclosure label ^ Interface ^ Notes ^
+| VE.Can 1 | vecan0 | Isolated |
+| VE.Can 2 | vecan1 | Non-isolated |
+When using SignalK on Venus OS on an Ekrano, there is currently no port enabled for N2K traffic in the default configuration. Configure it manually instead, see here for more information: https://community.victronenergy.com/questions/263126/ekrano-gx-vs-signal-k-no-n2k-on-vecan-socket.html?childToView=263206#answer-263206.
 ==== 6.5 Signal K FAQ ====
-=== Q1 How to best handle & install a GPS ===
+=== Q1 - How to best handle & install a GPS ===
 You want the data available in SignalK and in Venus OS, so that it gets to VRM. And preferably a quality GPS.
@@ Line 395: / Line 486: @@
 Tbd. Actually a NMEA0183-network is probably something that doesnt exist: you can't have NMEA0183 in a network, its point to point.
+=== Q2 - What happens when I updated a pre-installed Plugin? ===
+A few plugins are installed by default on Venus OS Large. These include FreeboardSK, signalk-venus-plugin and more. They are part of the (read-only) image of Venus OS.
+When a newer version of such plugin is available, it is still possible to install the update - by pressing the Update button in the Signal K Admin UI -> Appstore -> Installed page.
+The newer version of the plugin gets installed onto the data partition. And Signal K server will use that, as it prioritises the version of the plugins installed there over the one included in the image.
+WARNING: above also means that once Venus OS ships with a newer version of the plugin than the version installed manually, Signal K Server will keep using that older one. To get out of such situation, remove the plugin by using the Appstore -> Installed page, and then the trash icon.
+Note that the same icon is also available for the pre-installed plugins. Pressing it does nothing - since they can't be removed.
+=== Q3 - Can I update signalk-server? ===
+Signal K Server comes preinstalled with Venus OS. And except by "hacking into it", it cannot be partially updated:
+The normal -and recommended- method to get a newer version of Signal K Server is to wait for Victron to release a newer version of Venus OS.
+In case you can’t wait, and don’t mind the extra work as well as risks, here is how to update it yourself.
+Be warned, this method might or might not remain working  - its documented only for convenience.
+Note that all changes made to the rootfs will be overwritten the next time you do a Venus OS update.
+Step 1: Get yourself [[https://www.victronenergy.com/live/ccgx:root_access|root access]] into your GX Device.
+Step 2: Follow this procedure:
+<code>
+## Change the rootfs from read-only to read/write, as well as increase file system size
+## to use the complete partition.
+/opt/victronenergy/swupdate-scripts/resize2fs.sh
+## Backup a file you'll need to restore later
+# dev-tip: a list of especially installed files on a Victron install is here:
+# https://github.com/victronenergy/meta-victronenergy/tree/master/meta-third-party/recipes-extended/signalk-server
+# in that folder, open the .bb file and read the do_install function
+cp /usr/lib/node_modules/signalk-server/get-mfd-announce-address.sh /data/home
+## See version as well as install location for signalk-server
+npm list -g
+# output will be something like this:
+# /usr/lib
+# ├── @victronenergy/node-red-contrib-victron@1.5.2
+# ├── corepack@0.17.0
+# ├── node-red@3.1.0
+# ├── npm@9.5.1
+# └── signalk-server@1.46.3
+## Stop signalk-server
+svc -d /service/signalk-server
+## Update to a newer version, here is how to update to last released version:
+npm install -g signalk-server
+# And to update to a more specific version, do something similar to this:
+# npm install -g signalk-server@2.3.0-beta.2
+# Output will be something like this:
+# added 120 packages, removed 179 packages, and changed 586 packages in 6m
+#
+# 57 packages are looking for funding
+#  run `npm fund` for details
+## Restore that file
+mv /data/home/get-mfd-announce-address.sh /usr/lib/node_modules/signalk-server
+## Install the signalk-venus-plugin in same place where it normally is on Venus OS
+cd /usr/lib/node_modules/signalk-server
+npm install signalk-venus-plugin
+## If you want, see updated version:
+npm list -g
+# output will be similar as above, but then with newer version
+## start signalk-server again, and see log output:
+svc -u /service/signalk-server && tail -F /data/log/signalk-server/current | tai64nlocal
+## press CTRL-C to stop seeing the log. signalk-server will keep running in the background.
+</code>
 ===== 7. Remote access via VRM =====
@@ Line 402: / Line 576: @@
 {{ :venus-os:venus_os_large_menu2.png?nolink |}}
+===== 8. Troubleshooting =====
+==== 8.1 Disk space issues / data partition full ====
+Using both Signal K Server, as well as Node-RED, it is quite easy to completely fill up the data partition. Which can cause all sorts of issues, like:
+  - Venus OS itself no longer working correctly,
+  - Signal K Server refuses to start / no longer works,
+  - Node-RED refuses to start,
+  - and similar.
+Note that Venus OS itself does **not** show a notification or warning when the data disk is full. And know that the other disks are read-only unless remounted to read/write as per [[https://www.victronenergy.com/live/ccgx:root_access|these root access instructions]].
+Depending on what the issue is, there are a few things you can do:
+  - Do full GX factory reset, as per the instructions in the GX user manuals. This includes downloading a file called venus-data.tgz; see GX manual for details. Disadvantage is that you'll need to reconfigure the GX.
+  - Remove all Signal K Server log files. In case you're using SignalK, then we recommend to try that option first. See next chapter on how to do that (requires a USB stick or SD Card), and once done make sure to double check you're Signal K log setup; Most importantly, enable the ''Keep only most recent data log files'' option.
+  - A more detailed approach is logging in on SSH, and checking for disk space:
+**Tips and tricks to login a diagnose disk space**
+Require root access: https://www.victronenergy.com/live/ccgx:root_access.
+The ''df'' command shows disk space including percentage in user for all mounted storages. Note the 100% full of below data partition. That is a problem. It should show maybe 10, 20 or 30%, but never 100% in use.
+<code>
+root@einstein:/data/conf/signalk# df
+Filesystem           1K-blocks      Used Available Use% Mounted on
+/dev/root               988960    869484     48596  95% /
+devtmpfs                465376         4    465372   0% /dev
+tmpfs                   515040       952    514088   0% /run
+tmpfs                   515040       276    514764   0% /var/volatile
+/dev/mmcblk1p5         1182728   1182728         0 100% /data
+tmpfs                   515040       952    514088   0% /service
+overlay                 515040       276    514764   0% /var/lib
+</code>
+The ''du'' command, used as per below, shows space per folder in the directory tree. In this case up to 3 levels deep. And what you can see here is that almost all space is used by the files are in the /data/conf/signalk/ directory. Which for this example turned out to be log files, disabled by default.
+<code>
+root@Cerbo:/data/conf/signalk#  du -d 3 /data | sort -nr
+1103640	/data
+1099352	/data/conf
+1099276	/data/conf/signalk
+	/data/conf/signalk/node_modules
+	/data/conf/signalk/.npm
+	/data/conf/signalk/.cache
+	/data/log
+	/data/log/swupdate
+	/data/var
+	/data/var/lib
+	/data/log/signalk-server
+	/data/conf/signalk/plugin-config-data
+</code>
+This is a view of a more healthy tree:
+<code>
+root@Cerbo:/data/conf/signalk#  du -d 3 /data | sort -nr
+	/data
+	/data/conf
+	/data/conf/signalk
+	/data/conf/signalk/node_modules
+	/data/conf/signalk/.npm
+	/data/conf/signalk/.cache
+	/data/log
+	/data/log/swupdate
+</code>
+==== 8.2 Backup / Reset to factory defaults  ====
+There are scenarios where you want to make a backup of your data or when you want to clear logging or even start all over and go back to factory defaults. In order to make this process easy, you can put one (or more) of the following files on an USB stick and reboot your device. The files will be unpacked and the scripts within will execute. Once the script is ready with its tasks, a notification of 3 beeps can be heard (on a Multiplus-II GX the notification will be shown in the display). After which the USB stick can be removed.
+  * [[https://www.victronenergy.com/upload/software/venus-factory-default/venus-data-00-backup-data-partition.tgz|venus-data-00-backup-data-partition.tgz]] - copies all that is on the ''/data'' partition onto the usb stick
+  * [[https://www.victronenergy.com/upload/software/venus-factory-default/venus-data-20-signalk-reset.tgz|venus-data-20-signalk-reset.tgz]] - wipes everything from ''/data/conf/signalk/''
+  * [[https://www.victronenergy.com/upload/software/venus-factory-default/venus-data-30-signalk-delete-data-logs.tgz|venus-data-30-signalk-delete-data-logs.tgz]] - removes all SignalK loging
+  * [[https://www.victronenergy.com/upload/software/venus-factory-default/venus-data-20-node-red-reset.tgz|venus-data-20-node-red-reset.tgz]] - wipes all in ''/data/home/nodered/''
+See [[https://www.victronenergy.com/live/ccgx:root_access#hooks_to_install_run_own_code_at_boot|here]] for more information on how this process works.