Rename Chef option ipv6only to enable_ipv4

Author: erwinpan1

examples/chef/chef.py

@@ -345,7 +345,7 @@ def main() -> int:
     parser.add_option(
         "", "--ci", help="Builds Chef examples defined in cicd_config. Uses --use_zzz. Uses specified target from -t. Chef exits after completion.", dest="ci", action="store_true")
     parser.add_option(
-        "", "--ipv6only", help="Disable IPv4. Applicable to platforms that can support IPV4 (e.g, Linux, ESP32)",
+        "", "--enable_ipv4", help="Enable IPv4 mDNS. Only applicable to platforms that can support IPV4 (e.g, Linux, ESP32)",
         action="store_true", default=False)
     parser.add_option(
         "", "--cpu_type", help="CPU type to compile for. Linux only.", choices=["arm64", "arm", "x64"])
@@ -658,12 +658,12 @@ def main() -> int:
 
         if options.build_target == "esp32":
             shell.run_cmd(f"cd {_CHEF_SCRIPT_PATH}/esp32")
-            if options.ipv6only:
+            if options.enable_ipv4:
                 shell.run_cmd(
-                    f"sed -i 's/#\\ CONFIG_DISABLE_IPV4\\ is\\ not\\ set/CONFIG_DISABLE_IPV4=y/g' sdkconfig ")
+                    f"sed -i 's/CONFIG_DISABLE_IPV4=y/#\\ CONFIG_DISABLE_IPV4\\ is\\ not\\ set/g' sdkconfig ")
             else:
                 shell.run_cmd(
-                    f"sed -i 's/CONFIG_DISABLE_IPV4=y/#\\ CONFIG_DISABLE_IPV4\\ is\\ not\\ set/g' sdkconfig ")
+                    f"sed -i 's/#\\ CONFIG_DISABLE_IPV4\\ is\\ not\\ set/CONFIG_DISABLE_IPV4=y/g' sdkconfig ")
             shell.run_cmd("idf.py build")
             shell.run_cmd("idf.py build flashing_script")
             shell.run_cmd(
@@ -781,7 +781,9 @@ def main() -> int:
                     flush_print(
                         f"Unable to cross compile for x64 on {uname_resp}")
                     exit(1)
-            if options.ipv6only:
+            if options.enable_ipv4:
+                linux_args.append("chip_inet_config_enable_ipv4=true")
+            else:
                 linux_args.append("chip_inet_config_enable_ipv4=false")
 
             if sw_ver_string: