diff --git a/flake.lock b/flake.lock
index fbc46f6..658be24 100644
--- a/flake.lock
+++ b/flake.lock
@@ -1,5 +1,21 @@
 {
   "nodes": {
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1733328505,
+        "narHash": "sha256-NeCCThCEP3eCl2l/+27kNNK7QrwZB1IJCrXfrbv5oqU=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "ff81ac966bb2cae68946d5ed5fc4994f96d0ffec",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
     "flake-utils": {
       "locked": {
         "lastModified": 1659877975,
@@ -15,54 +31,79 @@
         "type": "github"
       }
     },
-    "flake-utils_2": {
+    "gitignore": {
+      "inputs": {
+        "nixpkgs": [
+          "pre-commit-hooks",
+          "nixpkgs"
+        ]
+      },
       "locked": {
-        "lastModified": 1644229661,
-        "narHash": "sha256-1YdnJAsNy69bpcjuoKdOYQX0YxZBiCYZo4Twxerqv7k=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "3cecb5b042f7f209c56ffd8371b2711a290ec797",
+        "lastModified": 1709087332,
+        "narHash": "sha256-HG2cCnktfHsKV0s4XW83gU3F57gaTljL9KNSuG6bnQs=",
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "rev": "637db329424fd7e46cf4185293b9cc8c88c95394",
         "type": "github"
       },
       "original": {
-        "owner": "numtide",
-        "repo": "flake-utils",
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
         "type": "github"
       }
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1661626419,
-        "narHash": "sha256-CjdPtdwH7I5Es4SjdCGuNfeulIyaM1LP0dXGWi4dyuQ=",
+        "lastModified": 1735531152,
+        "narHash": "sha256-As8I+ebItDKtboWgDXYZSIjGlKeqiLBvjxsQHUmAf1Q=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "a5e05d62460ff0b7627559a8b55ab421041ebf0a",
+        "rev": "3ffbbdbac0566a0977da3d2657b89cbcfe9a173b",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
+        "ref": "nixos-24.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-stable": {
+      "locked": {
+        "lastModified": 1735286948,
+        "narHash": "sha256-JMRV2RI58nV1UqLXqm+lcea1/dr92fYjWU5S+Rz3fmE=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "31ac92f9628682b294026f0860e14587a09ffb4b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-24.05",
         "repo": "nixpkgs",
         "type": "github"
       }
     },
     "pre-commit-hooks": {
       "inputs": {
-        "flake-utils": "flake-utils_2",
+        "flake-compat": "flake-compat",
+        "gitignore": "gitignore",
         "nixpkgs": [
           "nixpkgs"
-        ]
+        ],
+        "nixpkgs-stable": "nixpkgs-stable"
       },
       "locked": {
-        "lastModified": 1660830093,
-        "narHash": "sha256-HUhx3a82C7bgp2REdGFeHJdhEAzMGCk3V8xIvfBqg1I=",
+        "lastModified": 1734797603,
+        "narHash": "sha256-ulZN7ps8nBV31SE+dwkDvKIzvN6hroRY8sYOT0w+E28=",
         "owner": "cachix",
-        "repo": "pre-commit-hooks.nix",
-        "rev": "8cb8ea5f1c7bc2984f460587fddd5f2e558f6eb8",
+        "repo": "git-hooks.nix",
+        "rev": "f0f0dc4920a903c3e08f5bdb9246bb572fcae498",
         "type": "github"
       },
       "original": {
         "owner": "cachix",
-        "repo": "pre-commit-hooks.nix",
+        "repo": "git-hooks.nix",
         "type": "github"
       }
     },
diff --git a/flake.nix b/flake.nix
index bab44d0..2c9124a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -2,25 +2,27 @@
   description = "Tankerkönig-to-MQTT gateway";
 
   inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11";
 
     flake-utils.url = "github:numtide/flake-utils";
 
-    pre-commit-hooks.url = "github:cachix/pre-commit-hooks.nix";
+    pre-commit-hooks.url = "github:cachix/git-hooks.nix";
     pre-commit-hooks.inputs.nixpkgs.follows = "nixpkgs";
   };
 
   outputs = { self, nixpkgs, flake-utils, pre-commit-hooks }:
     flake-utils.lib.eachSystem [ "x86_64-linux" ] (system:
       let
+        ghcv = "ghc96";
         pkgs = nixpkgs.legacyPackages.${system};
 
         overlay = final: prev: {
           tk2mqtt = final.callCabal2nix "tk2mqtt" ./. { };
         };
 
-        haskellPackages = pkgs.haskell.packages.ghc924.extend overlay;
-      in {
+        haskellPackages = pkgs.haskell.packages.${ghcv}.extend overlay;
+      in
+      {
         packages.default = haskellPackages.tk2mqtt;
 
         apps = {
@@ -37,13 +39,14 @@
         checks = {
           pre-commit-check = pre-commit-hooks.lib.${system}.run {
             src = ./.;
-            settings = { ormolu.defaultExtensions = [ "GHC2021" ]; };
-            tools.fourmolu = haskellPackages.fourmolu;
             hooks = {
-              nixfmt.enable = true;
-              fourmolu.enable = true;
+              nixpkgs-fmt.enable = true;
               hpack.enable = true;
               hlint.enable = true;
+              ormolu = {
+                enable = true;
+                settings.defaultExtensions = [ "GHC2021" ];
+              };
               doctest = {
                 enable = false;
                 name = "Run documentation tests";
@@ -64,14 +67,15 @@
 
           nativeBuildInputs = with pkgs; [
             haskellPackages.haskell-language-server
-            haskellPackages.fourmolu
+            # haskellPackages.fourmolu
             haskellPackages.hspec-discover
             haskellPackages.doctest
             cabal-install
             ghcid
-            nixfmt
+            nixfmt-rfc-style
             hpack
             hlint
+            yaml-language-server
           ];
         };
       });
diff --git a/package.yaml b/package.yaml
index ab369cd..73e33c4 100644
--- a/package.yaml
+++ b/package.yaml
@@ -15,14 +15,18 @@ dependencies:
   - directory
   - containers
   - net-mqtt
+  - network-uri
   - req
+  - effectful
   - aeson
   - text
-#  - bytestring
+  - bytestring
+  - process
 
 ghc-options:
   - -Wall
   - -fdefer-typed-holes
+  - -threaded
 
 default-extensions:
   - BlockArguments
diff --git a/src/TK2MQTT.hs b/src/TK2MQTT.hs
index 1fbaeb8..f8603ad 100644
--- a/src/TK2MQTT.hs
+++ b/src/TK2MQTT.hs
@@ -1,26 +1,40 @@
-{-# LANGUAGE RecordWildCards #-}
+{-# LANGUAGE OverloadedStrings #-}
 
-module TK2MQTT (
-  runTK2MQTT,
-  defaultMain,
-) where
+module TK2MQTT
+  ( runTK2MQTT,
+    defaultMain,
+  )
+where
 
+import Control.Exception (catch)
+import Control.Monad (void)
+import Control.Monad.IO.Class
+import Data.Aeson
+import Network.HTTP.Req
+import Network.MQTT.Client qualified as MQTT
+import Network.URI (URI, parseURI)
 import System.Environment qualified as Env
 import System.IO
 
-import Control.Exception qualified as Exception
-import System.IO.Error qualified as IOError
+newtype APIKey = APIKey String
 
-runTK2MQTT :: IO ()
-runTK2MQTT = do
-  putStrLn "Hello"
+newtype StationID = StationID String
 
-eitherToError :: Show a => Either a b -> IO b
-eitherToError = either (Exception.throwIO . IOError.userError . show) return
+runTK2MQTT :: URI -> APIKey -> StationID -> IO ()
+runTK2MQTT uri (APIKey apikey) (StationID stationId) = do
+  mc <- MQTT.connectURI MQTT.mqttConfig uri
+  result <- runReq defaultHttpConfig $ do
+    r <- req GET (https "creativecommons.tankerkoenig.de" /: "json" /: "prices.php") NoReqBody jsonResponse ("apikey" =: apikey <> "ids" =: stationId)
+    pure (responseBody r :: Value)
+  void $ liftIO $ MQTT.publish mc "tmp/fuel/diesel" (encode result) True
+  void $ liftIO $ print $ encode result
 
 handleError :: IOError -> IO ()
 handleError e = do
   hPutStrLn stderr $ "I ran into an issue: " <> show e
 
 defaultMain :: IO ()
-defaultMain = Exception.catch runTK2MQTT handleError
+defaultMain = do
+  [apikey, stationId] <- Env.getArgs
+  let (Just uri) = parseURI "mqtt://hm.felis-halfmoon.ts.net"
+  runTK2MQTT uri (APIKey apikey) (StationID stationId) `catch` handleError
diff --git a/test/spec/TK2MQTTSpec.hs b/test/spec/TK2MQTTSpec.hs
index 66ed07b..2e3ddce 100644
--- a/test/spec/TK2MQTTSpec.hs
+++ b/test/spec/TK2MQTTSpec.hs
@@ -1,12 +1,8 @@
 module TK2MQTTSpec (spec) where
 
-import HCat.Internal
-
+import TK2MQTT.Internal
 import Test.Hspec
 import Test.Hspec.QuickCheck (prop)
 
 spec :: Spec
-spec = do
-  describe "parseArgs" do
-    it "returns the filename if given a single argument" do
-      True `shouldBe` True
+spec = pure ()
diff --git a/tk2mqtt.cabal b/tk2mqtt.cabal
new file mode 100644
index 0000000..0ad3370
--- /dev/null
+++ b/tk2mqtt.cabal
@@ -0,0 +1,135 @@
+cabal-version: 1.12
+
+-- This file has been generated from package.yaml by hpack version 0.36.1.
+--
+-- see: https://github.com/sol/hpack
+
+name:           tk2mqtt
+version:        0.0.1.0
+description:    Tankerkönig-to-MQTT gateway
+author:         Alexander Kobjolke
+maintainer:     alex@jakalx.net
+copyright:      Alexander Kobjolke 2023
+license:        MIT
+build-type:     Simple
+extra-source-files:
+    README.org
+
+library
+  exposed-modules:
+      TK2MQTT
+      TK2MQTT.Internal
+  other-modules:
+      Paths_tk2mqtt
+  hs-source-dirs:
+      src
+  default-extensions:
+      BlockArguments
+      OverloadedStrings
+      ImportQualifiedPost
+  ghc-options: -Wall -fdefer-typed-holes -threaded
+  build-depends:
+      aeson
+    , base >=4.13 && <5
+    , bytestring
+    , containers
+    , directory
+    , effectful
+    , net-mqtt
+    , network-uri
+    , process
+    , req
+    , text
+    , time
+  default-language: GHC2021
+
+executable tk2mqtt
+  main-is: tk2mqtt.hs
+  other-modules:
+      Paths_tk2mqtt
+  hs-source-dirs:
+      app
+  default-extensions:
+      BlockArguments
+      OverloadedStrings
+      ImportQualifiedPost
+  ghc-options: -Wall -fdefer-typed-holes -threaded
+  build-depends:
+      aeson
+    , base >=4.13 && <5
+    , bytestring
+    , containers
+    , directory
+    , effectful
+    , net-mqtt
+    , network-uri
+    , process
+    , req
+    , text
+    , time
+    , tk2mqtt
+  default-language: GHC2021
+
+test-suite doctest
+  type: exitcode-stdio-1.0
+  main-is: Doctest.hs
+  other-modules:
+      Paths_tk2mqtt
+  hs-source-dirs:
+      test/doctest
+  default-extensions:
+      BlockArguments
+      OverloadedStrings
+      ImportQualifiedPost
+  ghc-options: -Wall -fdefer-typed-holes -threaded
+  build-tool-depends:
+      doctest:doctest
+  build-depends:
+      aeson
+    , base >=4.13 && <5
+    , bytestring
+    , containers
+    , directory
+    , effectful
+    , net-mqtt
+    , network-uri
+    , process
+    , req
+    , text
+    , time
+  default-language: Haskell2010
+
+test-suite spec
+  type: exitcode-stdio-1.0
+  main-is: Spec.hs
+  other-modules:
+      TK2MQTTSpec
+      Paths_tk2mqtt
+  hs-source-dirs:
+      test/spec
+  default-extensions:
+      BlockArguments
+      OverloadedStrings
+      ImportQualifiedPost
+  ghc-options: -Wall -fdefer-typed-holes -threaded
+  cpp-options: -DTEST
+  build-tool-depends:
+      hspec-discover:hspec-discover
+  build-depends:
+      QuickCheck
+    , aeson
+    , base >=4.13 && <5
+    , bytestring
+    , containers
+    , directory
+    , effectful
+    , hspec
+    , net-mqtt
+    , network-uri
+    , process
+    , quickcheck-instances
+    , req
+    , text
+    , time
+    , tk2mqtt
+  default-language: GHC2021