Seems to be working great

component-source/component/CmpAtomModbus.c

@@ -1,4 +1,3 @@
-#define _GNU_SOURCE
 #define _DEFAULT_SOURCE
 #include "../src/atom_bridge.h"
 #include "CmpStd.h"
@@ -32,5 +31,3 @@ void CDECL CDECL_EXT atmbcall_cext(atmbcall_cext_struct *p)
 #include "../src/atom_rtu.c"
 #include "../src/atom_server.c"
 #include "../src/atom_bridge.c"
-
-#include "../src/atom_worker.c"

component-source/component/makefile

@@ -1,8 +1,8 @@
 # Generated from supplied ExtensionSDK; build with target Linux toolchain.
 SDKDIR ?= ../../ExtensionSDK
 MAJORVER=0
-MINORVER=7
-CMPVERSION=0x00040000
+MINORVER=4
+CMPVERSION=0x00050000
 # Local development ID; check no other component uses this ID.
 CMPID=0x2001
 DOS2UNIX=dos2unix
@@ -10,6 +10,4 @@ M4=m4
 CC ?= gcc
 # The SDK otherwise includes CmpFrame in its component identity wildcard.
 override CSRC := CmpAtomModbus.c
-CFLAGS += -pthread
-LDLIBS += -pthread
 include $(SDKDIR)/makefile