Openhab exec transformation Transform an input to an output using JavaScript. The JsonPath expression to be used has to be set in the function parameter. openhab. 453 [WARN ] [. Transformation profile (as used with MAP) is one of those, it ain’t going to work to modify an Item command for exec input channel consumption, in the opposite direction. das komplette System von der Benutzer Oberfläche aus aktualisieren, neustarten oder herunterfahren können? Durch das Exec Binding ist das kein Problem! 1. Regarding rarity of Exec transform, in my case I wrote my own MQTT client processor executable with logic derived from an SQL db and SOAP transactions with a webservice I wrote for some garage equipment, cut a long story short, a total hack of some functionality that just works, thus the usage of Exec. I set up a fresh installation of “Raspbian GNU/Linux 9 (stretch)” an Hello! My actual use case is I want to end up with a button or switch in a sitemap that my wife can poke from openhab on her cellphone to turn my son’s internet access on and off. To organize the various transformations, one Nevertheless transformation in the label works, there is nothing to fix , imho. I wrote python script, that return string: {“fw”: “3. transform - Transformations to apply on the execution result string. The file name must have the . Please note: This profile is a one-way Hi Bert - A slight diversion from your question of managing this via the exec binding I also had zelio’s managed via the exact same process , using a adaption of the same c program that @Jeroen_Ost wrote, which served me well for many many years. I also created an exec command thing and in the command box I placed the same command. Please note: This profile is a one-way What does the openhab. After hours of research, trial and error, it is now working in a rudimentary way, but I want to learn how to make it more pretty. Hi everybody. Binary data contains 3 bytes and strict data format is The filename (within the transform folder) of the scale file has to be set in the function parameter. exec. Most of the time cancel is used used in conjunction with setting the timer handler to null as a convenient indicator that some previously defined timer is now finished with. Every command needs to be listed on a Dear all, I have a problem with 2. Item. e. Basically on Processing incoming data (opens new window) # Available variables #Core Actions. The Exec transformation service will pass a value to an external program. You have removed the line from the rule that sent an ON command to the exec run channel Item. 355 [WARN ] [. Following is an example how to set up an exec command thing, pass it a parameter, debug it with a rule and set the returned string to an I installed the exec binding for openhab2 but I cannot even get the simplest example to work. 5. The exec command and JS transform How can I use the DHT22 sensor with openhab3? After trying some things with the DHT22 in openhab3 (openHAB 3. However setting the handler to null does not interact with the timer itself. The idea is, since the input is a string, you do that yourself before submitting your command to exec. In FIRST mode this profile discards values for the configured time after a value is sent. binding. via apt-get) an openhab user is created and the service runs under that user. When I moved to OH3, I started experiencing numerous issues with the exec binding seeming to choreograph . I can’t forget about the map transform in this case because: That’s what I put into profile="transform:XXC" That’s what MAP transformation was created for; That what the MAP transformation is used for everywhere else in OH # Jinja Transformation Service. 455 [WARN ] [hab. items file in the items folder; I created a new milli. model. Indeed as The XPath expression to be executed has to be set in the function parameter. g. The transformation may return null to express its operation resulted in a null output. numerical format. Please note: This profile is a one-way The VAT Transformation Service adds VAT (Value-Added Tax) to a given input amount. log at the INFO level. Featured; All; Exec. ExecBinding] - transformation throws exception [transformation=JS(pars The transformation you apply to the label happens after that. The external program must either be in the executable search path of the server process, or an absolute path has to The regular expression to be executed has to be set in the function parameter. Simple transformation rules can also be given as a inline script. Turn on DEBUG logging for package org. I receive mqtt messages and it’s stored to this one item, and in the item config, there’s the option for Thanks For your help. net. Bindings. TransformationHelper] - Cannot get service reference for transformation service of type REGEXP 2019-06-24 18:49:27. This service allows you to execute commands in the underlying OS to persist item states. I don’t know if this helps - but I had to install (via the PaperUI) the various transforms - none were installed by default for me. If omitted the default is %s, so the input value will be put into the transformation without any format changes. An On a Linux system the system user openhab needs to have the privileges needed to execute your intended command. This file should be in property syntax, i. ” But remember channels have bi-directional capability. I started to study OpenHAB2, but don’t understand how to work with JSON transformation. The output contains a dump of information from my panasonic cloud AC - and in that, there is a JSON-formatted section, I would like to pick in. interval - An interval, in seconds, the command will be Usage of Transformations in the label parameter of Sitemap elements works the same way. It could be used to, for example, call the original rrdtool CLI tool. only values from a The filename (within the transform folder) of the scale file has to be set in the function parameter. js):'01001 01000 %s'], >[OFF:192. 0 snapshot Describe what I have proposed in the issue that the breaking PR was trying to resolve My current workaround History of functionlity from OH 2. I also used the EXEC binding, but it only gives me strings, which is of little use for a temperature sensor, The regular expression to be executed has to be set in the function parameter. Please note: This profile is a one-way If VAT is not known for the configured country or the provided percentage is invalid, the default is 0%, so the input value will be put into the transformation without any changes. Basically on Processing incoming data (opens new window) # Available variables # Jinja Transformation Service. only values from a device towards the item are changed, the other direction is left untouched. Following is an example how to set up an exec command thing, pass it a parameter, debug it with a rule and set the returned string to an Here you go, sorry for the delay work commitments slowed me down: 1: Download the two files and put in the respective folders and remove the . If omitted, the default is %s, so the input If VAT is not known for the configured country or the provided percentage is invalid, the default is 0%, so the input value will be put into the transformation without any changes. HttpBinding] - Couldn't transform response because transformationService of type 'REGEXP' is unavailable The XSLT file (from within the transform folder) to be used has to be set in the function parameter. The following shows three examples: Hello Hive Mind, I am trying to use the exec binding with android adb key events. Could you point out the download location of that file? I have a small raspberry pi cluster and want to display its system values in openHAB. Transforms an input string with an external program. io. From my point of view, I would not expect anything outside of the closing paren to be passed to the transformation. A simple one is using a map transformation: Contact Transformations are used to translate data from a cluttered or technical raw value to a processed or human-readable representation. Executes an external program and returns the output as a string. I recommend that Hi! I installed Openhab 3 on a Synology natively without docker. Need help with Exec - Transformation Services | openHAB The command is: Python C:\\openHAB\\conf\\scripts\\transform. A “Script” in the UI is just a rule with a single script action tagged with “Script”. 2 and am trying to use some output I get from running a python3 command using the exec-binding. ThingManager] - Cannot delegate command 'off' for item 'schwippbogen' to handler for channel 'exec:command:schwippbogen:input', because no thing with the UID 'exec:command:schwippbogen' could be found. This case can be smoothly avoided with a. 587 [WARN ] [hab. The XPath expression to be executed has to be set in the function parameter. AND. One of the most common problems I help people with on this forum is dealing with the Exec binding. This is a example thread to show how the exec binding 2. I installed openhabian 1. So org. This tutorial only works since openHAB 2. The first capturing group becomes the result of the transformation. This persistence service supports only writing information, and so features such as restoreOnStartup and sitemap Chart widgets cannot be used with this service. For security reasons all commands that are used by the exec binding or transformation need to be whitelisted. The external program must either be in the executable search path of the server process, or an absolute path has to The JsonPath expression to be used has to be set in the function parameter. So I have learned from the Transformation - Javascript I don’t now exactly what information you are looking for, so pls find a small addition: I added the Number line to my system. 943 [WARN ] [hab. If VAT is not known for the configured country or the provided percentage is invalid, the default is 0%, so the input value will be put into the transformation without any changes. In the given command line the placeholder %s is substituted with the When it becomes a little more complicated, you can use a transformation. only values from a The XPath expression to be executed has to be set in the function parameter. Josar (Josar) June 5, 2018, 7:38am 36 Hello, I try to read the system temperature of my Raspberry via the systeminfo binding. 5 to OH3 via openHABian - and so far most of the things work fine. To do that, I think I want to use the exec binding as that will let me check the running state of the script so multiple hits won’t lose sync with what’s on the switch. script. You can start, Go to the current stable version. The input string must be either an ISO 3166 alpha-2 country code or a percentage, i. 4. With this screen shot the whitelist entry must be exactly. persistence # Data Transformation Transformations are used to translate between technical and human-readable values for items. exec in logback. 3f. 0. NaN=Non Numeric State presented # Formatting output The workaround is to use jq and exec transformation instead of jsonpath transformation. things file, I did not include a “transform=” option but the Main UI shows “Transform REGEX((. But there is a software to switch the sockets simultaneously: GitHub - The regular expression to be executed has to be set in the function parameter. # Configuration The filename (within the transform folder) of the scale file has to be set in the function parameter. This binding integrates the possibility to execute arbitrary shell commands. Rules. Basically on Processing incoming data (opens new window) # Available variables Search for exec and install the Binding. XPath 22:07:51. If omitted the default is %s, Scale transform is designed to work with numeric or quantity states. The Javascript file (from within the transform folder) to be used has to be set in the function parameter. %. persistence. path) syntax for specifying transformations. A Exec binding does not provide ‘command’ transformation features. Transforms an input string with an external program. I would like to discuss this. But I discovered these lines in the logs: 2020-12-23 17:12:59. Binary data contains 3 bytes and strict data format is Hi, I want to pass parameters to a transformation Javascript without having to use rules, is this possible? Like this for example? Switch Brennenstuhl_3A "Test Connair" (Outdoor, Lights) { udp=">[ON:192. # Jinja Transformation Service. The majority of profiles only modify the payload in the channel-to-Item update path. transform - A transformation (opens new window) to apply on the execution result string. karaf. When the value presented to scale transform does not match this (most of the time with NULL or UNDEF states) it will not be handled and a warning is raised in the openhab. log [WARN ] [ome. TransformationHelper] - Cannot get service reference for transformation service of type REGEX 22:07:51. Featured; All; persistence. The Item definition looks like this: Number UPS_house_runtime "UPS battery runtime [%. 0 to control my TV. exec, openhab3. I could do this The Rollershutter Position emulates absolute position setting for Rollershutter devices which only support basic UP/DOWN/STOP commands. js):'01001 01000 %s']" } (The purpose of the That would be the equivalent of a lobotomy for openHAB. 2018-08-14 09:07:44. log say? mmm I did’t noticed this beforeHere it is: 2018-07-05 14:43:07. Hey, I’m using the Exec Binding 2. FeatureInstaller] - The Hello I’m new to Openhab but i’ve found it intriguing how configurable it is and defiently like it 🙂 I’ve although ran into a problem i hope you guys can assist me with in respect to “Exec-bindings” A bit about my project: I am looking to enabled/install the regex transformation via the console. 0 Build #1212. What i want to display: CPU temperature, Physical Memory Assistance with exec binding in openhab 3. The parameter sourceFormat is optional and can be used to format the input value before the transformation, i. I am running 3. 2 to get all things, items etc Since I used JavaScript Transformation before, the restore from BackUp did put it on the “list” for On a Linux system the system user openhab needs to have the privileges needed to execute your intended command. thus the usage of Exec. You might Transformations are used for generic bindings like MQTT, HTTP, COAP and any other direct protocol interaction to transform an incoming wire string to something that a channel can Does anyone have an example of doing an Exec transformation in an item definition? I have a value in bytes that I would like to convert to human readable format. 2), I turn to you. map extension. We start with a thing to connect to the exec binding. log . So the line you added isn’t really necessary. OpenHab supports transformation scripts written in Javascript. Function: Transform the given value “Profiles define how Channels and Items work together. Please note: This profile is a one-way # Jinja Transformation Service. Currently, the binding supports a single type of Thing, being the command Thing. 15:49880:JS(getTXPValue. Exec - Bindings | openHAB. Transforms a value using a jinja template. 943 [WARN ] [. It works fine, but now I started with exec bindings for connecting the multiple socket outlet. The following shows three examples: I did startOH 4 with a fresh openhabian install on a raspi4 and used a BackUp from 3. If omitted, the default is %s, so the input Usage of Transformations in the label parameter of Sitemap elements works the same way. only values from a Exec (opens new window) Jinja (opens new window) Scale (opens new window) XPath (opens new window) XSLT (opens new window) The following describes examples for Map, Regex, and JsonPath. Please note: This profile is a one-way #Binary To JSON Transformation Service. Example item configuration: The Javascript file (from within the transform folder) to be used has to be set in the function parameter. ExecHandler] - In the . Please note: This profile is a one-way Dear all, After having read the official tutorials, I’m now tackling my first project: reading the temperature from a DHT-11 sensor that is connected to my Raspberry Pi and displaying the value via the Basic UI. exec The mapping filename (within the transform folder) has to be set in the function parameter. Following is an example how to set up an exec command thing, pass it a parameter, debug it with a rule and set the returned string to an This binding integrates the possibility to execute arbitrary shell commands. Debounce (Time) Profile. Wäre es nicht toll wenn wir openHAB bzw. It expects the transformation rule to be read from a file which is stored under the transform folder. The external program must either be in the executable search path of the server process, or an absolute path has to # Exec Transformation Service. I was able to install the binding itself, I also installed the GPIO binding and defined the following item: Number RaspberryCPUTemp logs/openhab. 2019-02-09 14:28:56. With longer breaks between. Following is an example how to set up an exec command thing, pass it a parameter, debug it with a rule and set the returned string to a On a Linux system the system user openhab needs to have the privileges needed to execute your intended command. core. runtime"} It would be much more user-friendly to display the number of minutes remaining. Note that the MQTT Binding also supports automatic discovery of Things for devices that use the Homie or Home Assistant # Exec Binding. 0 snapshot 1194 (January 23) I placed ‘Python “absolute path to python program” %s’ in exec whitelist, but it shows ‘Tried to execute “command” but not in whitelist’. 937 [ERROR] [core. This tutorial will use the MQTT binding as an example. Beginners. path and parentheses JSONPATH($. The following shows three examples: On a Linux system the system user openhab needs to have the privileges needed to execute your intended command. ExecHandler] - Cou # Exec Transformation Service. 3. 430 [WARN ] [core. xml. only values from a The loggers defined in the config file inherit from higher up loggers. 1 on a Raspberry Pi 3B and it appears that the regex transformation was not included, so I am also seeing: [WARN ] [ng. 1. Background When openHAB is installed in the automated way (i. ExecHandler] - Couldn't transform response because transformationService of type 'REGEX' is unavailable Any ideas? I don’t like WARN’s in my The mapping filename (within the transform folder) has to be set in the function parameter. Being able to write rules in actual files is what makes openHAB so wonderful for me. 2. Please note: This profile is a one-way The filename (within the transform folder) of the scale file has to be set in the function parameter. You might do that via rule. The output I get back from the exec binding when triggering run looks like this: --- creating token by The filename (within the transform folder) of the scale file has to be set in the function parameter. The Exec Binding or Exec Action are actually the most powerful tools you can use in openHAB. only values from a Question: would there be any way to call a script as defined in the UI?Probably not. Not if there is a replacement (see RFC: YAML configuration · Issue #3666 · openhab/openhab-core · GitHub). Unfortunately something went wrong. 1-alpine” Hi! to avoid a zoo on javascript transformation functions, I’d like to cluster my common use cases and determine in the function what to do, based on the item name/uid/, thing name/uid/ for which the transformation was called. Based on this thread I’ve #Binary To JSON Transformation Service. Java Script transformation service. So I wrote a script which The JsonPath expression to be used has to be set in the function parameter. only values from a The mapping filename (within the transform folder) has to be set in the function parameter. Note that the What @timl is saying by 1 to 1 is the whitelist line must match character for character, including case. 2017-06-21 23:00:24. i am working only with only one Thing Exec and trying to manipulate it from the rule. Yes but it’s just a regular rule so it would be like I posted up in post 103. This profile is a one-way transformation; only values from a The JsonPath expression to be used has to be set in the function parameter. # Examples The regular expression to be executed has to be set in the function parameter. thing. 0 My openhab works very well and suddenly it’s bug. TransformationHelper] - Cannot get service reference for transformation service of type REGEX 23:10:50. Transforms the input by mapping it to another string. Transforms the input by Java Binary Block Parser syntax. Please note: This profile is a one-way The regular expression to be executed has to be set in the function parameter. There is also a binding for this device, but it’s only possible to switch the sockets one by one. I configure all throught the UI. only values from a Okay, so now you have made autorun=false - that means the exec will not be triggered when you send arguments to the exec input channel. 9. Binding installieren: For example, if you wish to use the Exec binding with openHAB running on Linux, you will need a working understanding of shell commands, file permissions, users, etc. I want to get the second capturing group or the third and so on. 7. 8: 1400: September 23, 2022 Exec binding channel transformation to link switch item to string channel. I tried to bring the output value from my bash script, which is stored in /etc/openhab/scripts, with items and things into my openhab. @rlkoshak now i get that i can not add the channel of Exec to an Number item. On a Linux system the system user openhab needs to have the privileges needed to execute your intended command. Then apply the Map transformation in the profile so the 1/0 gets changed to ON/OFF before the updated gets to the Item. They are often useful, to interpret received Item values, like sensor readings or state variables, and to Overview of available transformation services. meteoalarm-wind will already be configured to log out to openhab. Exec binding does not provide ‘command’ transformation features. Please note: This profile is a one-way The XSLT file (from within the transform folder) to be used has to be set in the function parameter. 357 [WARN ] [hab. x works with detailed explanations. I have broken it down to a minimal example Thing definition UID: http:url:43ff2e7adb label: HTTP URL Thing thingTypeUID: # JavaScript Transformation Service. What i have installed: Systeminfo Binding, Exec Binding, openHAB 2. I am able to send the initial key event, but all subsequent commands do not function. http. 8”,“nam The XPath expression to be executed has to be set in the function parameter. txt extension 2 :Ensure openhab has write permissions on items and rules folders (these are hard coded as etc/openhab2/* so if you need to change you need to edit the rules file and replace all occurrences with your path) The Exec transformation service will pass a value to an external program. 0fs]" {networkupstools="house:battery. Running the script takes a little The regular expression to be executed has to be set in the function parameter. 168. Please note: This profile is a one-way transformation, i. Thanks for your reply HJM, apologies but I seem to be stupid. It can be used to debounce Item The XPath expression to be executed has to be set in the function parameter. Map. Hi ! - am on OH3. In the given command line the placeholder %s is substituted with the input value. Also install regex transformation or open the console. The mapping filename (within the transform folder) has to be set in the function parameter. If omitted, the default is %s, so the input value will be returned from the transformation without any format changes. M2 I upgraded from #1512 to #1518 today. 359 [ERROR] [ab. 0 to OH 2. But I always get a warning in the console and i don’t get it . . py %s I have placed it in the whitelist file. The problem is DSL. Following is an example how to set up an exec command thing, pass it a parameter, debug it with a rule and set the returned string to a I’ve read Exec - Transformation Services | openHAB and other related documentation. Tbh it’d be much better if the exec mqtt incoming msg transformation worked but it just The XPath expression to be executed has to be set in the function parameter. Therfore not all features of the home assistant templating are supported. But I dont want that. ssh -p 8101 openhab@localhost habopen feature:list |grep rrd4j feature:install openhab-persistence-rrd4j feature:list |grep exec feature:install openhab-binding-exec feature:list |grep regex feature:install openhab-transformation-regex feature:list |grep exec feature:install openhab Dear all, I have some problems on OH3 to configure my rollershutter item via the http-binding. In Paper UI, “JSONPath Transformation” is installed. The problem isn’t text file configs in and of themselves. The output of the program is used as the transformed value. only values from a Is the Exec transform addon working for others in OH3 latest snapshot? ssh -p 8101 openhab@localhost Password:habopen feature:install openhab-binding-exec feature:install openhab-transformation-regex logout Now everything should be ready for setting up the OpenHAB UI. The idea is that new users can just use the parantheses Hi everyone, I migrated vom OH2. handler. only values from a # Exec Transformation Service. ExecHandler] - Couldn’t transform response because transformationService of type ‘REGEX’ is unavailable log 2019-06-24 18:49:27. sitemap file. Also I do have a DHCP server running on the same machine which is why I cannot use DHCP discovery. Basically on Processing incoming data (opens new window) # Available variables Persistence services allow openHAB to store time series data for history-based actions or statistics. 3:10:50. FeatureInstaller] - Failed installing 'openhab-binding-hue, This bundle provides a list of useful Profiles. Binary data contains 3 bytes and strict data format is Heyo, I got a little problem with the RegEx transformation service. 026 [WARN ] [ab. If omitted the default is %s, so the input value will be put into the transformation without any format changes. 5(A)=>5 for Power consumption is: 2535(W)=> 5 for Device is ON =>ON is my transform regex correct ? ``` Hi, I have search but not find any solution for my problem. i am close but i am retrieving. The openhab user has the following attributes: no shell so one cannot log in or su to this On a Linux system the system user openhab needs to have the privileges needed to execute your intended command. The following Actions are a core part of openHAB and do not need to be separately installed. Python Is it possible to transform ON and OFF to e. openhab, like org. What I’m trying to do is whenever I receive a message in mqtt, I want to use exec transformation to run lets say a python script which turns the item state to uppercase and updates item (or updates to another item) This binding integrates the possibility to execute arbitrary shell commands. The main purpose of this transformer is the use in the home assistant discovery. So basically the Problem is the Exec Binding channel which returns a string and this can not be casted to a Number item. Because you need two transformations here, instead of applying the JSONPATH in a profile, apply it to the Thing. Purpose Explain recent history of the functionality, along with faults Describe a breaking change that is committed to ESH and is currently in the OH 2. Never. please forget map transformation in this case, try to keep it simple and generic. Please note: This profile is a one-way Once this is done, hopefully, all binding transformations will: Use core’s ChannelTransformation class to perform transformations, instead of using separate in-binding implementations Support both colon JSONPATH:$. some_lamp_on and some_lamp_off for the String (or Switch) item. openhab is defined as a logger with level INFO meaning that anything under org. only values from a # Jinja Transformation Service. Scripts & Rules. So I’m writing this post so I can reference it later. I want to check if my Amazon Echo is online and as the Echo is not pingable and does not have any open ports I cannot use the network binding. only values from a # Map Transformation Service. js file in the transform folder and added the function line to that; I added the Text line to my default. It expects the mappings to be read from a file which is stored under the transform folder. #Exec Persistence v1. # Event Bus Actions sendCommand(String itemName, String commandString): Sends the given command to the specified Item to the event bus. It can be installed via Settings / Other Add-ons. transform. This profile is a one-way transformation; only values from a The Javascript file (from within the transform folder) to be used has to be set in the function parameter. only values from a Hi, I’ve an item linked to the Network UPS Tools binding which returns the number of seconds of UPS battery power remaining. Transformations can also be used in rules to transform/translate/convert data. To organize the various transformations, one should use subfolders. only values from a Also the REGEX and EXEC transformation have to be installed. for Electric Current is: 11. It can be used to debounce Item #Binary To JSON Transformation Service. 4: 953: September 7, 2022 Clean cache and tmp from UI. Basically on Processing incoming data (opens new window) # Available variables The Timer object supports the following methods: cancel: prevents the scheduled timer from executing. In LAST mode this profile delays commands or state updates for a configured number of milliseconds and only send the value if no other value is received with that timespan. So, taken together, your exec will never get triggered. 025 [WARN ] [. ; I suggest you paste some of the contents of your items, js and sitemap The XPath expression to be executed has to be set in the function parameter. The This integrates the possibility to execute arbitrary shell commands to openHAB. transform. ssh -p 8101 openhab@localhost Password:habopen feature:install openhab-binding-exec feature:install openhab-transformation-regex logout Now everything should be ready for setting up the OpenHAB UI. ExecHandler] - Couldn't transform response Configuration Parameter Type Description; inRangeValue: integer: The value which will be send when the profile detects ON and current time is between start time and end time (default: 100, min: 0, max: 100). *))” which appears to be the default. Usage of Transformations in the label parameter of Sitemap elements works the same way. postUpdate(String itemName, String commandString): Sends the given status update to the Platform information: image: “openhab/openhab:3. This bundle provides a list of useful Profiles: Debounce (Time) Profile. I use openhab 3 I have included the exec binding and try to get a command to run with a parameter. If omitted the default is %s, so the @Nullable String transform (String function, String source) throws TransformationException Transforms the input source by means of the given function and returns the transformed output. internal. You need a transformation addon for this. TransformationHelper] - Cannot get service reference for transformation service of type REGEX 2017-06-21 23:00:24. exec. If omitted, the default is %s, so the input # JavaScript Transformation Service. See details about syntax from JBBP homepage (opens new window) # Example Let's assume we have received string containing bytes in hexa string format 03FAFF and we want to convert binary data to JSON format. I just tried to follow up your suggestion, which leaded me to this problem. For example, if you wish to use the Exec binding with openHAB running on Linux, you will need a working understanding of shell commands, file permissions, users, etc. The shell command to be executed has to be set in the function parameter. ksxg jetktj xqujhr vezd evvz xpqot pveef kmyur dgsi drk