diff --git a/.gitmodules b/.gitmodules
index 455984e..6a7e4f7 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -10,3 +10,6 @@
 [submodule "fw/Libs/scd4x"]
 	path = fw/Libs/scd4x
 	url = git@gitlab.com:VelesLabs/stm32libs/scd4x.git
+[submodule "fw/Libs/modbus"]
+	path = fw/Libs/modbus
+	url = git@gitlab.com:VelesLabs/stm32libs/modbus.git
diff --git a/fw/.cproject b/fw/.cproject
index ba2b41d..9b11f6c 100644
--- a/fw/.cproject
+++ b/fw/.cproject
@@ -34,6 +34,7 @@
 									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/Libs/crc8}&quot;"/>
 									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/Libs/sgp40}&quot;"/>
 									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/Libs/scd4x}&quot;"/>
+									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/Libs/modbus}&quot;"/>
 								</option>
 								<inputType id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.input.366934534" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.input"/>
 							</tool>
@@ -65,6 +66,7 @@
 									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/Libs/crc8}&quot;"/>
 									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/Libs/sgp40}&quot;"/>
 									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/Libs/scd4x}&quot;"/>
+									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/Libs/modbus}&quot;"/>
 								</option>
 								<inputType id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.input.c.1544503170" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.input.c"/>
 							</tool>
@@ -94,6 +96,7 @@
 						<entry flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name="Core"/>
 						<entry flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name="Drivers"/>
 						<entry flags="VALUE_WORKSPACE_PATH" kind="sourcePath" name="Libs/crc8"/>
+						<entry flags="VALUE_WORKSPACE_PATH" kind="sourcePath" name="Libs/modbus"/>
 						<entry flags="VALUE_WORKSPACE_PATH" kind="sourcePath" name="Libs/scd4x"/>
 						<entry flags="VALUE_WORKSPACE_PATH" kind="sourcePath" name="Libs/sgp40"/>
 						<entry flags="VALUE_WORKSPACE_PATH" kind="sourcePath" name="Libs/sht4x"/>
@@ -132,6 +135,7 @@
 									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/Libs/crc8}&quot;"/>
 									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/Libs/sgp40}&quot;"/>
 									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/Libs/scd4x}&quot;"/>
+									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/Libs/modbus}&quot;"/>
 								</option>
 								<inputType id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.input.1707174983" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.input"/>
 							</tool>
@@ -162,6 +166,7 @@
 									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/Libs/crc8}&quot;"/>
 									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/Libs/sgp40}&quot;"/>
 									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/Libs/scd4x}&quot;"/>
+									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/Libs/modbus}&quot;"/>
 								</option>
 								<inputType id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.input.c.1160143889" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.input.c"/>
 							</tool>
diff --git a/fw/Libs/modbus b/fw/Libs/modbus
new file mode 160000
index 0000000..3777433
--- /dev/null
+++ b/fw/Libs/modbus
@@ -0,0 +1 @@
+Subproject commit 3777433c60f52edb7dbbca408badaac9766569ec