diff --git a/.gitmodules b/.gitmodules
index 19f28e0..acd8ca3 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -7,3 +7,6 @@
 [submodule "components/esp-wolfssl"]
 	path = components/esp-wolfssl
 	url = https://github.com/maximkulkin/esp-wolfssl.git
+[submodule "components/esp-homekit-common-functions"]
+	path = components/esp-homekit-common-functions
+	url = https://github.com/maccoylton/esp-homekit-common-functions
diff --git a/components/esp-homekit-common-functions b/components/esp-homekit-common-functions
new file mode 160000
index 0000000..2b13d78
--- /dev/null
+++ b/components/esp-homekit-common-functions
@@ -0,0 +1 @@
+Subproject commit 2b13d78023987eaeea0d38993e13d9caa59a0ce4