diff --git a/Gemfile b/Gemfile
index aa43920..8e7837e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -72,6 +72,7 @@ group :test do
   # Use system testing [https://guides.rubyonrails.org/testing.html#system-testing]
   gem "capybara"
   gem "selenium-webdriver"
+  gem "webmock"
 end
 
 gem "tailwindcss-rails", "~> 4.3"
diff --git a/Gemfile.lock b/Gemfile.lock
index 9757805..6a7bf89 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -98,6 +98,9 @@ GEM
     chunky_png (1.4.0)
     concurrent-ruby (1.3.5)
     connection_pool (2.5.4)
+    crack (1.0.1)
+      bigdecimal
+      rexml
     crass (1.0.6)
     csv (3.3.5)
     date (3.4.1)
@@ -116,6 +119,7 @@ GEM
       raabro (~> 1.4)
     globalid (1.3.0)
       activesupport (>= 6.1)
+    hashdiff (1.2.1)
     httparty (0.23.2)
       csv
       mini_mime (>= 1.0.0)
@@ -388,6 +392,10 @@ GEM
       activemodel (>= 6.0.0)
       bindex (>= 0.4.0)
       railties (>= 6.0.0)
+    webmock (3.26.2)
+      addressable (>= 2.8.0)
+      crack (>= 0.3.2)
+      hashdiff (>= 0.4.0, < 2.0.0)
     websocket (1.2.11)
     websocket-driver (0.8.0)
       base64
@@ -442,6 +450,7 @@ DEPENDENCIES
   turbo-rails
   tzinfo-data
   web-console
+  webmock
 
 BUNDLED WITH
    2.6.9
diff --git a/lib/my_smsa_pio/notifications/ntfy/publisher.rb b/lib/my_smsa_pio/notifications/ntfy/publisher.rb
new file mode 100644
index 0000000..3aefccd
--- /dev/null
+++ b/lib/my_smsa_pio/notifications/ntfy/publisher.rb
@@ -0,0 +1,49 @@
+require "httparty"
+
+module MySmsaPio
+  module Notifications
+    module Ntfy
+      class Publisher
+        def initialize(admin)
+          @admin = admin
+        end
+
+        def publish(title:, message:, priority: 3, tags: [], click: nil)
+          return false unless @admin.ntfy_configured?
+
+          body = {
+            topic: @admin.ntfy_topic,
+            title: title,
+            message: message,
+            priority: priority,
+            tags: Array(tags)
+          }
+          body[:click] = click if click.present?
+
+          url = "#{server_url}/#{@admin.ntfy_topic}"
+
+          response = HTTParty.post(
+            url,
+            body: body.to_json,
+            headers: {
+              "Content-Type" => "application/json",
+              "Authorization" => "Bearer #{@admin.ntfy_token}"
+            },
+            timeout: 10
+          )
+
+          response.success?
+        rescue StandardError => e
+          Rails.logger.error("ntfy publish failed for admin #{@admin.id}: #{e.message}")
+          false
+        end
+
+        private
+
+        def server_url
+          @admin.ntfy_server_url.presence || ENV["NTFY_SERVER_URL"] || "https://ntfy.sh"
+        end
+      end
+    end
+  end
+end
diff --git a/test/lib/my_smsa_pio/notifications/ntfy/publisher_test.rb b/test/lib/my_smsa_pio/notifications/ntfy/publisher_test.rb
new file mode 100644
index 0000000..4ee130f
--- /dev/null
+++ b/test/lib/my_smsa_pio/notifications/ntfy/publisher_test.rb
@@ -0,0 +1,105 @@
+require "test_helper"
+
+module MySmsaPio
+  module Notifications
+    module Ntfy
+      class PublisherTest < ActiveSupport::TestCase
+        setup do
+          @admin = AdminUser.create!(
+            name: "Notifier", email: "notif@example.com",
+            password: "password123",
+            ntfy_topic: "mysmsa-test-topic",
+            ntfy_token: "tk_test_token",
+            ntfy_enabled: true,
+            ntfy_server_url: "https://ntfy.example.com"
+          )
+        end
+
+        test "publish sends POST to the correct ntfy URL with JSON body and auth header" do
+          stubbed = stub_request(:post, "https://ntfy.example.com/mysmsa-test-topic")
+            .with(
+              headers: {
+                "Authorization" => "Bearer tk_test_token",
+                "Content-Type" => "application/json"
+              },
+              body: hash_including(
+                "topic" => "mysmsa-test-topic",
+                "title" => "Gateway offline",
+                "message" => /gw-001 went offline/,
+                "priority" => 4,
+                "tags" => ->(tags) { tags.include?("rotating_light") }
+              )
+            )
+            .to_return(status: 200, body: "", headers: {})
+
+          result = Publisher.new(@admin).publish(
+            title: "Gateway offline",
+            message: "gw-001 went offline at #{Time.current}",
+            priority: 4,
+            tags: ["rotating_light"]
+          )
+
+          assert result
+          assert_requested stubbed
+        end
+
+        test "publish returns false on HTTP failure without raising" do
+          stub_request(:post, "https://ntfy.example.com/mysmsa-test-topic")
+            .to_return(status: 500, body: "error")
+
+          result = Publisher.new(@admin).publish(
+            title: "Test",
+            message: "body",
+            priority: 3,
+            tags: []
+          )
+
+          assert_not result
+        end
+
+        test "publish returns false if admin not ntfy_configured?" do
+          unconfigured = AdminUser.create!(
+            name: "No Ntfy", email: "none@example.com",
+            password: "password123"
+          )
+
+          result = Publisher.new(unconfigured).publish(
+            title: "X", message: "Y", priority: 3, tags: []
+          )
+
+          assert_not result
+        end
+
+        test "publish uses default server URL from ENV when ntfy_server_url is nil" do
+          ENV["NTFY_SERVER_URL"] = "https://default-ntfy.example.com"
+          admin = AdminUser.create!(
+            name: "Default", email: "default@example.com",
+            password: "password123",
+            ntfy_topic: "def-topic", ntfy_token: "tk_def",
+            ntfy_enabled: true
+          )
+
+          stub = stub_request(:post, "https://default-ntfy.example.com/def-topic")
+            .to_return(status: 200, body: "", headers: {})
+
+          Publisher.new(admin).publish(title: "T", message: "M", priority: 3, tags: [])
+          assert_requested stub
+        ensure
+          ENV.delete("NTFY_SERVER_URL")
+        end
+
+        test "publish includes click URL when provided" do
+          stub = stub_request(:post, "https://ntfy.example.com/mysmsa-test-topic")
+            .with(body: hash_including("click" => "https://app.example.com/admin/gateways"))
+            .to_return(status: 200, body: "", headers: {})
+
+          Publisher.new(@admin).publish(
+            title: "T", message: "M", priority: 3, tags: [],
+            click: "https://app.example.com/admin/gateways"
+          )
+          assert_requested stub
+        end
+      end
+    end
+  end
+end
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 0c22470..3910fec 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -1,6 +1,7 @@
 ENV["RAILS_ENV"] ||= "test"
 require_relative "../config/environment"
 require "rails/test_help"
+require "webmock/minitest"
 
 module ActiveSupport
   class TestCase