extmod/modnetwork: Add extended socket state.

extmod/modnetwork.h

@@ -85,9 +85,15 @@ typedef struct _mod_network_socket_obj_t {
             uint8_t domain;
             uint8_t type;
             int8_t fileno;
+            uint8_t bound;
         } u_param;
         mp_uint_t u_state;
     };
+    #if MICROPY_PY_USOCKET_EXTENDED_STATE
+    // Extended socket state for NICs/ports that need it.
+    int32_t timeout;
+    void *state;
+    #endif
 } mod_network_socket_obj_t;
 
 extern const mod_network_nic_type_t mod_network_nic_type_wiznet5k;

extmod/modusocket.c

@@ -54,6 +54,7 @@ STATIC mp_obj_t socket_make_new(const mp_obj_type_t *type, size_t n_args, size_t
     s->u_param.domain = MOD_NETWORK_AF_INET;
     s->u_param.type = MOD_NETWORK_SOCK_STREAM;
     s->u_param.fileno = -1;
+    s->u_param.bound = false;
     if (n_args >= 1) {
         s->u_param.domain = mp_obj_get_int(args[0]);
         if (n_args >= 2) {
@@ -64,6 +65,11 @@ STATIC mp_obj_t socket_make_new(const mp_obj_type_t *type, size_t n_args, size_t
         }
     }
 
+    #if MICROPY_PY_USOCKET_EXTENDED_STATE
+    s->timeout = 0;
+    s->state = NULL;
+    #endif
+
     return MP_OBJ_FROM_PTR(s);
 }