diff --git a/.github/workflows/build-package.yml b/.github/workflows/build-package.yml
new file mode 100644
index 0000000..3bd513d
--- /dev/null
+++ b/.github/workflows/build-package.yml
@@ -0,0 +1,132 @@
+name: build package
+
+on:
+  pull_request:
+    branches:
+      - main
+  workflow_dispatch:
+    inputs:
+      openwrt_version:
+        description: "OpenWrt version"
+        type: string
+        required: true
+        default: "23.05.3"
+      openwrt_arch:
+        description: "OpenWrt arch"
+        type: string
+        required: true
+        default: "mips_24kc"
+      openwrt_target:
+        description: "OpenWrt target"
+        type: string
+        required: true
+        default: "ath79"
+      openwrt_subtarget:
+        description: "OpenWrt subtarget"
+        type: string
+        required: true
+        default: "generic"
+      openwrt_vermagic:
+        description: "OpenWrt vermagic"
+        type: string
+        required: true
+        default: "auto"
+
+jobs:
+  build:
+    name: "v${{ matrix.build_env.tag }} - ${{ matrix.build_env.pkgarch }} :: ${{ matrix.build_env.target }}/${{ matrix.build_env.subtarget }} openwrt build"
+    runs-on: ubuntu-22.04
+    strategy:
+      matrix:
+        build_env:
+          - tag: ${{ inputs.openwrt_version || vars.DEFAULT_OPENWRT_VERSION }}
+            pkgarch: ${{ inputs.openwrt_arch || vars.DEFAULT_OPENWRT_ARCH }}
+            target: ${{ inputs.openwrt_target || vars.DEFAULT_OPENWRT_TARGET }}
+            subtarget: ${{ inputs.openwrt_subtarget || vars.DEFAULT_OPENWRT_SUBTARGET }}
+            vermagic: ${{ inputs.openwrt_vermagic || vars.DEFAULT_OPENWRT_VERMAGIC }}
+
+    env:
+      OPENWRT_RELEASE: ${{ matrix.build_env.tag }}
+      OPENWRT_ARCH: ${{ matrix.build_env.pkgarch }}
+      OPENWRT_TARGET: ${{ matrix.build_env.target }}
+      OPENWRT_SUBTARGET: ${{ matrix.build_env.subtarget }}
+      OPENWRT_VERMAGIC: ${{ matrix.build_env.vermagic }}
+
+    steps:
+      - name: checkout openwrt-loki-exporter
+        uses: actions/checkout@v4
+        with:
+          path: openwrt-loki-exporter
+          fetch-depth: 0
+
+      - name: checkout openwrt
+        uses: actions/checkout@v4
+        with:
+          path: openwrt
+          repository: openwrt/openwrt
+          ref: v${{ matrix.build_env.tag }}
+          fetch-depth: 0
+
+      - name: restore cached toolchain
+        id: restore-toolchain-cache
+        uses: actions/cache/restore@v4
+        with:
+          fail-on-cache-miss: false
+          key: ${{ runner.os }}-openwrt-cache-toolchain-${{ matrix.build_env.tag }}-${{ matrix.build_env.pkgarch }}-${{ matrix.build_env.target }}-${{ matrix.build_env.subtarget }}
+          restore-keys: |
+            ${{ runner.os }}-openwrt-cache-toolchain-${{ matrix.build_env.pkgarch }}-
+          path: |
+            openwrt/.config
+            openwrt/.config.old
+            openwrt/feeds.conf
+            openwrt/bin/**
+            openwrt/build_dir/**
+            openwrt/dl/**
+            openwrt/feeds/**
+            openwrt/package/**
+            openwrt/staging_dir/**
+            openwrt/tmp/**
+
+      - name: building openwrt toolchain
+        if: steps.restore-toolchain-cache.outputs.cache-hit != 'true'
+        id: build-toolchain
+        run: |
+          set -x
+          cd openwrt-loki-exporter
+          make show-env
+          time -p make build-toolchain
+          make purge-circular-symlinks
+
+      - name: save toolchain cache
+        if: steps.restore-toolchain-cache.outputs.cache-hit != 'true'
+        id: save-toolchain-cache
+        uses: actions/cache/save@v4
+        with:
+          key: ${{ runner.os }}-openwrt-cache-toolchain-${{ matrix.build_env.tag }}-${{ matrix.build_env.pkgarch }}-${{ matrix.build_env.target }}-${{ matrix.build_env.subtarget }}
+          path: |
+            openwrt/.config
+            openwrt/.config.old
+            openwrt/feeds.conf
+            openwrt/bin/**
+            openwrt/build_dir/**
+            openwrt/dl/**
+            openwrt/feeds/**
+            openwrt/package/**
+            openwrt/staging_dir/**
+            openwrt/tmp/**
+
+      - name: build package
+        id: build-package
+        run: |
+          set -x
+          cd openwrt-loki-exporter
+          make show-env
+          make export-env >> $GITHUB_OUTPUT
+          time -p make package
+          make prepare-artifacts
+
+      - name: upload artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: loki-exporter-${{ steps.build-package.outputs.version_str }}_v${{ matrix.build_env.tag }}_${{ matrix.build_env.pkgarch }}_${{ matrix.build_env.target }}_${{ matrix.build_env.subtarget }}
+          path: loki_exporter_artifacts/*
diff --git a/.github/workflows/build-toolchain-cache.yml b/.github/workflows/build-toolchain-cache.yml
new file mode 100644
index 0000000..9e7e31c
--- /dev/null
+++ b/.github/workflows/build-toolchain-cache.yml
@@ -0,0 +1,91 @@
+name: build toolchain cache
+
+on:
+  workflow_dispatch:
+    inputs:
+      openwrt_version:
+        description: "OpenWrt version"
+        type: string
+        required: true
+        default: "23.05.3"
+      openwrt_arch:
+        description: "OpenWrt arch"
+        type: string
+        required: true
+        default: "mips_24kc"
+      openwrt_target:
+        description: "OpenWrt target"
+        type: string
+        required: true
+        default: "ath79"
+      openwrt_subtarget:
+        description: "OpenWrt subtarget"
+        type: string
+        required: true
+        default: "generic"
+      openwrt_vermagic:
+        description: "OpenWrt vermagic"
+        type: string
+        required: true
+        default: "auto"
+
+jobs:
+  build:
+    name: "v${{ matrix.build_env.tag }} - ${{ matrix.build_env.pkgarch }} :: ${{ matrix.build_env.target }}/${{ matrix.build_env.subtarget }} openwrt build"
+    runs-on: ubuntu-22.04
+    strategy:
+      matrix:
+        build_env:
+          - tag: ${{ inputs.openwrt_version }}
+            pkgarch: ${{ inputs.openwrt_arch }}
+            target: ${{ inputs.openwrt_target }}
+            subtarget: ${{ inputs.openwrt_subtarget }}
+            vermagic: ${{ inputs.openwrt_vermagic }}
+
+    env:
+      OPENWRT_RELEASE: ${{ matrix.build_env.tag }}
+      OPENWRT_ARCH: ${{ matrix.build_env.pkgarch }}
+      OPENWRT_TARGET: ${{ matrix.build_env.target }}
+      OPENWRT_SUBTARGET: ${{ matrix.build_env.subtarget }}
+      OPENWRT_VERMAGIC: ${{ matrix.build_env.vermagic }}
+
+    steps:
+      - name: checkout openwrt-loki-exporter
+        uses: actions/checkout@v4
+        with:
+          path: openwrt-loki-exporter
+          fetch-depth: 0
+
+      - name: checkout openwrt
+        uses: actions/checkout@v4
+        with:
+          path: openwrt
+          repository: openwrt/openwrt
+          ref: v${{ matrix.build_env.tag }}
+          fetch-depth: 0
+
+      - name: building openwrt toolchain
+        id: build-toolchain
+        run: |
+          set -x
+          cd openwrt-loki-exporter
+          make show-env
+          time -p make build-toolchain
+          make purge-circular-symlinks
+
+      - name: save toolchain cache
+        id: save-toolchain-cache
+        uses: actions/cache/save@v4
+        with:
+          key: ${{ runner.os }}-openwrt-cache-toolchain-${{ matrix.build_env.tag }}-${{ matrix.build_env.pkgarch }}-${{ matrix.build_env.target }}-${{ matrix.build_env.subtarget }}
+          path: |
+            openwrt/.config
+            openwrt/.config.old
+            openwrt/feeds.conf
+            openwrt/bin/**
+            openwrt/build_dir/**
+            openwrt/dl/**
+            openwrt/feeds/**
+            openwrt/package/**
+            openwrt/staging_dir/**
+            openwrt/tmp/**
diff --git a/.gitignore b/.gitignore
index b64daaf..e0e9e17 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,4 @@ __pycache__
 create-test-env
 run-test-exporter-onetime
 tests/*.log.state
+loki-exporter/
diff --git a/Makefile b/Makefile
index ce1e010..ec8a5ef 100644
--- a/Makefile
+++ b/Makefile
@@ -2,19 +2,55 @@
 
 TOPDIR := $(realpath $(dir $(abspath $(lastword $(MAKEFILE_LIST)))))
 SELF := $(abspath $(lastword $(MAKEFILE_LIST)))
+UPPERDIR := $(realpath $(TOPDIR)/../)
+
+OPENWRT_SRCDIR   ?= $(UPPERDIR)/openwrt
+LOKI_EXPORTER_SRCDIR ?= $(TOPDIR)
+LOKI_EXPORTER_DSTDIR ?= $(UPPERDIR)/loki_exporter_artifacts
+
+OPENWRT_RELEASE   ?= 23.05.3
+OPENWRT_ARCH      ?= mips_24kc
+OPENWRT_TARGET    ?= ath79
+OPENWRT_SUBTARGET ?= generic
+OPENWRT_VERMAGIC  ?= auto
+
+OPENWRT_ROOT_URL  ?= https://downloads.openwrt.org/releases
+OPENWRT_BASE_URL  ?= $(OPENWRT_ROOT_URL)/$(OPENWRT_RELEASE)/targets/$(OPENWRT_TARGET)/$(OPENWRT_SUBTARGET)
+OPENWRT_MANIFEST  ?= $(OPENWRT_BASE_URL)/openwrt-$(OPENWRT_RELEASE)-$(OPENWRT_TARGET)-$(OPENWRT_SUBTARGET).manifest
+
+ifndef OPENWRT_VERMAGIC
+_NEED_VERMAGIC=1
+endif
+
+ifeq ($(OPENWRT_VERMAGIC), auto)
+_NEED_VERMAGIC=1
+endif
+
+ifeq ($(_NEED_VERMAGIC), 1)
+OPENWRT_VERMAGIC := $(shell curl -fs $(OPENWRT_MANIFEST) | grep -- "^kernel" | sed -e "s,.*\-,,")
+endif
 
 GITHUB_RUN_ID ?= 0
+GITHUB_SHA    ?= $(shell git rev-parse --short HEAD)
+VERSION_STR   ?= $(shell git describe --tags --long --dirty)
 
-DATE := $(shell date +"%Y%m%d")
+DATE    := $(shell date +"%Y%m%d")
 VERSION := $(shell git describe --tags --always --match='v[0-9]*' | cut -d '-' -f 1 | tr -d 'v')
 RELEASE := $(shell git describe --tags --always --match='v[0-9]*' --long | cut -d '-' -f 2)
-BUILD := $(shell git describe --tags --long --always --dirty)-$(DATE)-$(GITHUB_RUN_ID)
+BUILD   := $(shell git describe --tags --long --always --dirty)-$(DATE)-$(GITHUB_RUN_ID)
 
 SHOW_ENV_VARS = \
 	VERSION \
 	RELEASE \
+	GITHUB_SHA \
 	GITHUB_RUN_ID \
-	BUILD
+	VERSION_STR \
+	BUILD \
+	OPENWRT_RELEASE \
+	OPENWRT_ARCH \
+	OPENWRT_TARGET \
+	OPENWRT_SUBTARGET \
+	OPENWRT_VERMAGIC
 
 help: ## Show help message (list targets)
 	@awk 'BEGIN {FS = ":.*##"; printf "\nTargets:\n"} /^[$$()% 0-9a-zA-Z_-]+:.*?##/ {printf "  \033[36m%-25s\033[0m %s\n", $$1, $$2}' $(SELF)
@@ -23,11 +59,20 @@ show-var-%:
 	@{ \
 	escaped_v="$(subst ",\",$($*))" ; \
 	if [ -n "$$escaped_v" ]; then v="$$escaped_v"; else v="(undefined)"; fi; \
-	printf "%-13s %s\n" "$*" "$$v"; \
+	printf "%-20s %s\n" "$*" "$$v"; \
 	}
 
 show-env: $(addprefix show-var-, $(SHOW_ENV_VARS)) ## Show environment details
 
+export-var-%:
+	@{ \
+	escaped_v="$(subst ",\",$($*))" ; \
+	if [ -n "$$escaped_v" ]; then v="$$escaped_v"; else v="(undefined)"; fi; \
+	printf "%s=%s\n" "$*" "$$v"; \
+	}
+
+export-env: $(addprefix export-var-, $(SHOW_ENV_VARS)) ## Export environment
+
 results:
 	mkdir -p results
 
@@ -124,6 +169,92 @@ compare-logs: | results
 save-logs: | results
 	docker logs tests-loki-1 >results/loki.log 2>&1
 
+$(OPENWRT_SRCDIR):
+	@{ \
+	set -ex ; \
+	git clone https://github.com/openwrt/openwrt.git $@ ; \
+	cd $@ ; \
+	git checkout v$(OPENWRT_RELEASE) ; \
+	}
+
+$(OPENWRT_SRCDIR)/feeds.conf: | $(OPENWRT_SRCDIR)
+	@{ \
+	set -ex ; \
+	curl -fsL $(OPENWRT_BASE_URL)/feeds.buildinfo | tee $@ ; \
+	}
+
+$(OPENWRT_SRCDIR)/.config: | $(OPENWRT_SRCDIR)
+	@{ \
+	set -ex ; \
+	curl -fsL $(OPENWRT_BASE_URL)/config.buildinfo > $@ ; \
+	}
+
+.PHONY: build-toolchain
+build-toolchain: $(OPENWRT_SRCDIR)/feeds.conf $(OPENWRT_SRCDIR)/.config ## Build OpenWrt toolchain
+	@{ \
+	set -ex ; \
+	cd $(OPENWRT_SRCDIR) ; \
+	time -p ./scripts/feeds update ; \
+	time -p ./scripts/feeds install -a ; \
+	time -p make defconfig ; \
+	time -p make tools/install -i -j $(NPROC) ; \
+	time -p make toolchain/install -i -j $(NPROC) ; \
+	}
+
+# TODO: this should not be required but actions/cache/save@v4 could not handle circular symlinks with error like this:
+# Warning: ELOOP: too many symbolic links encountered, stat '/home/runner/work/amneziawg-openwrt/amneziawg-openwrt/openwrt/staging_dir/toolchain-mips_24kc_gcc-11.2.0_musl/initial/lib/lib'
+# Warning: Cache save failed.
+.PHONY: purge-circular-symlinks
+purge-circular-symlinks:
+	@{ \
+	set -ex ; \
+	cd $(OPENWRT_SRCDIR) ; \
+	export LC_ALL=C ; \
+	for deadlink in $$(find . -follow -type l -printf "" 2>&1 | sed -e "s/find: '\(.*\)': Too many levels of symbolic links.*/\1/"); do \
+		echo "deleting dead link: $${deadlink}" ; \
+		rm -f "$${deadlink}" ; \
+	done ; \
+	}
+
+loki-exporter: loki_exporter.sh loki_exporter.init loki_exporter.conf
+	mkdir -p $(TOPDIR)/$@
+	sed \
+		-e "s,%% PKG_VERSION %%,$(VERSION),g" \
+		-e "s,%% PKG_RELEASE %%,$(RELEASE),g" \
+		-e "s,%% BUILD_ID %%,$(BUILD),g" \
+		< $(TOPDIR)/Makefile.package > $(TOPDIR)/$@/Makefile
+	mkdir -p $(TOPDIR)/$@/files
+	for f in loki_exporter.init loki_exporter.conf; do \
+		install -m 644 $(TOPDIR)/$${f} $(TOPDIR)/$@/files/ ; \
+	done
+	install -m 755 $(TOPDIR)/loki_exporter.sh $(TOPDIR)/$@/files/loki_exporter.sh
+
+.PHONY: package
+package: loki-exporter ## Build OpenWRT package
+	@{ \
+        set -ex ; \
+        cd $(OPENWRT_SRCDIR) ; \
+        echo "src-link loki_exporter $(LOKI_EXPORTER_SRCDIR)" > feeds.conf ; \
+        ./scripts/feeds update ; \
+        ./scripts/feeds install -a ; \
+        mv .config.old .config ; \
+        echo "CONFIG_PACKAGE_loki-exporter=y" >> .config ; \
+        make defconfig ; \
+        make V=s package/loki-exporter/clean ; \
+        make V=s package/loki-exporter/download ; \
+        make V=s package/loki-exporter/prepare ; \
+        make V=s package/loki-exporter/compile ; \
+        }
+
+.PHONY: prepare-artifacts
+prepare-artifacts: ## Save loki-exporter artifacts (.ipk packages)
+	@{ \
+        set -ex ; \
+        cd $(OPENWRT_SRCDIR) ; \
+        mkdir -p $(LOKI_EXPORTER_DSTDIR) ; \
+        cp bin/packages/$(OPENWRT_ARCH)/loki_exporter/loki-exporter_*.ipk $(LOKI_EXPORTER_DSTDIR)/ ; \
+        }
+
 .PHONY: clean
 clean: delete-test-env ## Clean-up
 	find $(TOPDIR)/ -type f -name "*.pyc" -delete
@@ -133,3 +264,4 @@ clean: delete-test-env ## Clean-up
 	rm -f $(TOPDIR)/run-test-exporter-onetime
 	find $(TOPDIR)/tests/ -type f -name "*.log.state" -delete
 	rm -rf $(TOPDIR)/results
+	rm -rf $(TOPDIR)/loki-exporter
diff --git a/Makefile.package b/Makefile.package
new file mode 100644
index 0000000..64c3771
--- /dev/null
+++ b/Makefile.package
@@ -0,0 +1,48 @@
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=loki-exporter
+PKG_VERSION:=%% PKG_VERSION %%
+PKG_RELEASE:=%% PKG_RELEASE %%
+PKG_LICENSE:=MIT
+PKG_MAINTAINER:=Andrei Belov <defanator@gmail.com>
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/loki-exporter
+  SECTION:=net
+  CATEGORY:=Network
+  TITLE:=loki-exporter
+  DEPENDS:=+curl
+  PKGARCH:=all
+  URL:=https://github.com/defanator/openwrt-loki-exporter
+endef
+
+define Package/loki-exporter/description
+Tiny service for exporting system log to remote Loki instance,
+written in pure shell.
+
+Build ID: %% BUILD_ID %%
+
+endef
+
+define Build/Prepare
+endef
+
+define Build/Configure
+endef
+
+define Build/Compile
+endef
+
+define Package/loki-exporter/install
+	$(INSTALL_DIR) $(1)/usr/bin
+	$(INSTALL_BIN) ./files/loki_exporter.sh $(1)/usr/bin/loki_exporter
+
+	$(INSTALL_DIR) $(1)/etc/init.d
+	$(INSTALL_BIN) ./files/loki_exporter.init $(1)/etc/init.d/loki_exporter
+
+	$(INSTALL_DIR) $(1)/etc/config
+	$(INSTALL_CONF) ./files/loki_exporter.conf $(1)/etc/config/loki_exporter
+endef
+
+$(eval $(call BuildPackage,loki-exporter))
diff --git a/loki_exporter.config b/loki_exporter.conf
similarity index 100%
rename from loki_exporter.config
rename to loki_exporter.conf
diff --git a/loki_exporter.service b/loki_exporter.init
similarity index 100%
rename from loki_exporter.service
rename to loki_exporter.init