PPPoS: Rearrange config items (move TCP/IP stack size to LWIP), mark as experimental/unsupported

Ref #272

components/esp32/Kconfig

@@ -187,13 +187,6 @@ config SYSTEM_EVENT_TASK_STACK_SIZE
     help
         Config system event task stack size in different application.
 
-config TCPIP_TASK_STACK_SIZE
-    int "TCP/IP Task Stack Size"
-    default 2048
-    help
-       Configure TCP/IP task stack size, used by LWIP to process multi-threaded TCP/IP operations.
-       The default is 2048 bytes, setting this stack too small will result in stack overflow crashes.
-
 config MAIN_TASK_STACK_SIZE
     int "Main task stack size"
     default 4096

components/lwip/Kconfig

@@ -89,46 +89,54 @@ config LWIP_DHCP_DOES_ARP_CHECK
         Enabling this option allows check if the offered IP address is not already
         in use by another host on the network.
 
-config PPP_SUPPORT
-    bool "Enable PPP support"
-    default 0
+config TCPIP_TASK_STACK_SIZE
+    int "TCP/IP Task Stack Size"
+    default 2048
     help
-        Enable PPP stack. Now only PPP over serial is supported
+       Configure TCP/IP task stack size, used by LWIP to process multi-threaded TCP/IP operations.
+       The default is 2048 bytes, setting this stack too small will result in stack overflow crashes.
 
-if PPP_SUPPORT
+menuconfig PPP_SUPPORT
+    bool "Enable PPP support (new/experimental)"
+    default n
+    help
+        Enable PPP stack. Now only PPP over serial is possible.
+
+        PPP over serial support is experimental and unsupported.
 
 config PPP_PAP_SUPPORT
    bool "Enable PAP support"
-   default 0
+   depends on PPP_SUPPORT
+   default n
    help
        Enable Password Authentication Protocol (PAP) support
 
 config PPP_CHAP_SUPPORT
    bool "Enable CHAP support"
-   default 0
+   depends on PPP_SUPPORT
+   default n
    help
        Enable Challenge Handshake Authentication Protocol (CHAP) support
 
 config PPP_MSCHAP_SUPPORT
    bool "Enable MSCHAP support"
-   default 0
+   depends on PPP_SUPPORT
+   default n
    help
        Enable Microsoft version of the Challenge-Handshake Authentication Protocol (MSCHAP) support
 
 config PPP_MPPE_SUPPORT
    bool "Enable MPPE support"
-   default 0
+   depends on PPP_SUPPORT
+   default n
    help
        Enable Microsoft Point-to-Point Encryption (MPPE) support
 
 config PPP_DEBUG_ON
-   bool "Enable PPP debug logs"
-   default 0
+   bool "Enable PPP debug log output"
+   depends on PPP_SUPPORT
+   default n
    help
-       Enable PPP debug logs
-
-endif
+       Enable PPP debug log output
 
 endmenu
-
-

examples/protocols/pppos_client/README.md

@@ -4,6 +4,6 @@ It shows example of ppp client using lwip PPPoS api and GSM.
 Before you run this example, make sure your GSM is in command mode
 and is registered to network.
 
-Tested with GSM Telit GL865-DUAL V3.
+PPP over serial support is experimental and unsupported. This example was tested with GSM Telit GL865-DUAL V3.
 
 See the README.md file in the upper level 'examples' directory for more information about examples.