diff --git a/test/firmware/src/sys/modbus b/test/firmware/src/sys/modbus
index ae6b293..7be15f6 160000
--- a/test/firmware/src/sys/modbus
+++ b/test/firmware/src/sys/modbus
@@ -1 +1 @@
-Subproject commit ae6b2934dd510e3ff26f62dccd50de4655ea70af
+Subproject commit 7be15f65ea9d95919ebb6f923d1f6c328cb45b34