Created PPP service class

Created PPP service class that encapsulates the PPP protocol.
Class is similar to EMAC and L3IP classes with additional methods
to read IP and DNS server addresses negotiation using PPP and
to set PPP specific parameters (file handle for modem access etc.).

PPP service can use on its own thread or in run in mbed os event
Queue thread.

Added ppp_nsapi.cpp module that implements the nsapi_ppp.h
services.

Added ppp_nsapi.cpp module that implements the nsapi_ppp.h
services.

Author: Mika Leppänen

features/netsocket/ppp/include/ccp.h

@@ -31,7 +31,7 @@
  */
 
 #include "ppp_opts.h"
-#if PPP_SUPPORT && CCP_SUPPORT  /* don't build if not configured for use in lwipopts.h */
+#if PPP_SUPPORT && CCP_SUPPORT  /* don't build if not configured for use in ppp_opts.h */
 
 #ifndef CCP_H
 #define CCP_H

features/netsocket/ppp/include/chap-md5.h

@@ -29,7 +29,7 @@
  */
 
 #include "ppp_opts.h"
-#if PPP_SUPPORT && CHAP_SUPPORT  /* don't build if not configured for use in lwipopts.h */
+#if PPP_SUPPORT && CHAP_SUPPORT  /* don't build if not configured for use in ppp_opts.h */
 
 extern const struct chap_digest_type md5_digest;
 

features/netsocket/ppp/include/chap-new.h

@@ -29,7 +29,7 @@
  */
 
 #include "ppp_opts.h"
-#if PPP_SUPPORT && CHAP_SUPPORT  /* don't build if not configured for use in lwipopts.h */
+#if PPP_SUPPORT && CHAP_SUPPORT  /* don't build if not configured for use in ppp_opts.h */
 
 #ifndef CHAP_H
 #define CHAP_H

features/netsocket/ppp/include/chap_ms.h

@@ -31,7 +31,7 @@
  */
 
 #include "ppp_opts.h"
-#if PPP_SUPPORT && MSCHAP_SUPPORT  /* don't build if not configured for use in lwipopts.h */
+#if PPP_SUPPORT && MSCHAP_SUPPORT  /* don't build if not configured for use in ppp_opts.h */
 
 #ifndef CHAPMS_INCLUDE
 #define CHAPMS_INCLUDE

features/netsocket/ppp/include/eap.h

@@ -21,7 +21,7 @@
  */
 
 #include "ppp_opts.h"
-#if PPP_SUPPORT && EAP_SUPPORT  /* don't build if not configured for use in lwipopts.h */
+#if PPP_SUPPORT && EAP_SUPPORT  /* don't build if not configured for use in ppp_opts.h */
 
 #ifndef PPP_EAP_H
 #define	PPP_EAP_H

features/netsocket/ppp/include/ecp.h

@@ -32,7 +32,7 @@
  */
 
 #include "ppp_opts.h"
-#if PPP_SUPPORT && ECP_SUPPORT  /* don't build if not configured for use in lwipopts.h */
+#if PPP_SUPPORT && ECP_SUPPORT  /* don't build if not configured for use in ppp_opts.h */
 
 #ifndef ECP_H
 #define ECP_H

features/netsocket/ppp/include/eui64.h

@@ -36,7 +36,7 @@
 */
 
 #include "ppp_opts.h"
-#if PPP_SUPPORT && PPP_IPV6_SUPPORT  /* don't build if not configured for use in lwipopts.h */
+#if PPP_SUPPORT && PPP_IPV6_SUPPORT  /* don't build if not configured for use in ppp_opts.h */
 
 #ifndef EUI64_H
 #define EUI64_H
@@ -88,7 +88,7 @@ typedef union
 
 #define eui64_set32(e, l)	do {			\
 				(e).e32[0] = 0;		\
-				(e).e32[1] = lwip_htonl(l);	\
+				(e).e32[1] = ppp_htonl(l);	\
 				} while (0)
 #define eui64_setlo32(e, l)	eui64_set32(e, l)
 

features/netsocket/ppp/include/fsm.h

@@ -43,7 +43,7 @@
  */
 
 #include "ppp_opts.h"
-#if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
+#if PPP_SUPPORT /* don't build if not configured for use in ppp_opts.h */
 
 #ifndef FSM_H
 #define	FSM_H

features/netsocket/ppp/include/ipcp.h

@@ -43,7 +43,7 @@
  */
 
 #include "ppp_opts.h"
-#if PPP_SUPPORT && PPP_IPV4_SUPPORT /* don't build if not configured for use in lwipopts.h */
+#if PPP_SUPPORT && PPP_IPV4_SUPPORT /* don't build if not configured for use in ppp_opts.h */
 
 #ifndef IPCP_H
 #define	IPCP_H
@@ -61,10 +61,10 @@ extern "C" {
 #endif /* VJ_SUPPORT */
 #define	CI_ADDR		3
 
-#if LWIP_DNS
+#if PPP_DNS
 #define CI_MS_DNS1      129	/* Primary DNS value */
 #define CI_MS_DNS2      131     /* Secondary DNS value */
-#endif /* LWIP_DNS */
+#endif /* PPP_DNS */
 #if 0 /* UNUSED - WINS */
 #define CI_MS_WINS1     130     /* Primary WINS value */
 #define CI_MS_WINS2     132	/* Secondary WINS value */
@@ -101,15 +101,15 @@ typedef struct ipcp_options {
 #endif /* VJ_SUPPORT */
     unsigned int accept_local           :1; /* accept peer's value for ouraddr */
     unsigned int accept_remote          :1; /* accept peer's value for hisaddr */
-#if LWIP_DNS
+#if PPP_DNS
     unsigned int req_dns1               :1; /* Ask peer to send primary DNS address? */
     unsigned int req_dns2               :1; /* Ask peer to send secondary DNS address? */
-#endif /* LWIP_DNS */
+#endif /* PPP_DNS */
 
     u32_t ouraddr, hisaddr;	/* Addresses in NETWORK BYTE ORDER */
-#if LWIP_DNS
+#if PPP_DNS
     u32_t dnsaddr[2];	/* Primary and secondary MS DNS entries */
-#endif /* LWIP_DNS */
+#endif /* PPP_DNS */
 #if 0 /* UNUSED - WINS */
     u32_t winsaddr[2];	/* Primary and secondary MS WINS entries */
 #endif /* UNUSED - WINS */
@@ -120,9 +120,9 @@ typedef struct ipcp_options {
 #endif /* VJ_SUPPORT */
 } ipcp_options;
 
-#if 0 /* UNUSED, already defined by lwIP */
+#if 0 /* UNUSED, already defined */
 char *ip_ntoa (u32_t);
-#endif /* UNUSED, already defined by lwIP */
+#endif /* UNUSED, already defined */
 
 extern const struct protent ipcp_protent;
 

features/netsocket/ppp/include/ipv6cp.h

@@ -139,7 +139,7 @@
  */
 
 #include "ppp_opts.h"
-#if PPP_SUPPORT && PPP_IPV6_SUPPORT  /* don't build if not configured for use in lwipopts.h */
+#if PPP_SUPPORT && PPP_IPV6_SUPPORT  /* don't build if not configured for use in ppp_opts.h */
 
 #ifndef IPV6CP_H
 #define	IPV6CP_H