apc_modbus: Updates, command, writable variables and outlet group support

configure.ac

@@ -819,7 +819,7 @@ AC_CHECK_FUNCS(strtok_r fileno sigemptyset sigaction,
 dnl For these we have a fallback implementation via the other,
 dnl if at least one is available, so initial check is quiet.
 dnl This typically pops up in POSIX vs. Windows builds:
-AC_CHECK_FUNCS(localtime_r localtime_s gmtime_r gmtime_s,
+AC_CHECK_FUNCS(localtime_r localtime_s gmtime_r gmtime_s timegm _mkgmtime,
 	[], [])
 
 AC_MSG_CHECKING([for at least one gmtime implementation])
@@ -838,6 +838,14 @@ AS_IF([test x"${ac_cv_func_localtime_s}-${ac_cv_func_localtime_r}" = "xno-no"],
 	AC_MSG_RESULT([yes])
 	])
 
+AC_MSG_CHECKING([for at least one timegm implementation])
+AS_IF([test x"${ac_cv_func_timegm}-${ac_cv_func__mkgmtime}" = "xno-no"], [
+	AC_MSG_RESULT([no])
+	AC_MSG_WARN([Required C library routine timegm nor _mkgmtime was not found])
+	],[
+	AC_MSG_RESULT([yes])
+	])
+
 AC_LANG_PUSH([C])
 
 AC_CHECK_HEADER([string.h],

drivers/Makefile.am

@@ -360,7 +360,8 @@ nutdrv_qx_SOURCES += $(NUTDRV_QX_SUBDRIVERS)
 # tracking (which is automatic), but to ensure these files are
 # distributed by "make dist".
 
-dist_noinst_HEADERS = apc-mib.h apc-iem-mib.h apc-hid.h arduino-hid.h baytech-mib.h bcmxcp.h bcmxcp_ser.h	\
+dist_noinst_HEADERS = \
+ apc_modbus.h apc-mib.h apc-iem-mib.h apc-hid.h arduino-hid.h baytech-mib.h bcmxcp.h bcmxcp_ser.h	\
  bcmxcp_io.h belkin.h belkin-hid.h bestpower-mib.h blazer.h cps-hid.h dstate.h	\
  dummy-ups.h explore-hid.h gamatronic.h genericups.h	\
  generic_gpio_common.h generic_gpio_libgpiod.h	\