cc3200: Make WLAN.isconnected() also work in AP mode.

While in STA mode isconnected() returns True when connected to an AP
and the IP has been acquired. In AP mode, WLAN.isconnected() returns
True if at least one connected station is present.

cc3200/mods/modwlan.c

@@ -95,6 +95,8 @@ typedef struct _wlan_obj_t {
     uint8_t             ssid[33];
     uint8_t             bssid[6];
 
+    uint8_t             staconnected;
+
 } wlan_obj_t;
 
 /******************************************************************************
@@ -165,6 +167,7 @@ STATIC wlan_obj_t wlan_obj = {
         .ssid = {0},
         .bssid = {0},
         .mac = {0},
+        .staconnected = 0
 };
 
 STATIC const mp_cb_methods_t wlan_cb_methods;
@@ -225,10 +228,12 @@ void SimpleLinkWlanEventHandler(SlWlanEvent_t *pWlanEvent) {
         }
             break;
         case SL_WLAN_STA_CONNECTED_EVENT:
-            // TODO
+            wlan_obj.staconnected++;
             break;
         case SL_WLAN_STA_DISCONNECTED_EVENT:
-            // TODO
+            if (wlan_obj.staconnected > 0) {
+                wlan_obj.staconnected--;
+            }
             break;
         case SL_WLAN_P2P_DEV_FOUND_EVENT:
             // TODO
@@ -380,10 +385,8 @@ void wlan_init0 (void) {
 }
 
 void wlan_first_start (void) {
-    // clear wlan data after checking any of the status flags
-    wlan_initialize_data();
-
     if (wlan_obj.mode < 0) {
+        wlan_initialize_data();
         wlan_obj.mode = sl_Start(0, 0, 0);
         sl_LockObjUnlock (&wlan_LockObj);
     }
@@ -540,6 +543,7 @@ STATIC void wlan_initialize_data (void) {
     wlan_obj.gateway = 0;
     wlan_obj.ip = 0;
     wlan_obj.security = SL_SEC_TYPE_OPEN;
+    wlan_obj.staconnected = 0;
     memset(wlan_obj.ssid, 0, sizeof(wlan_obj.ssid));
     memset(wlan_obj.bssid, 0, sizeof(wlan_obj.bssid));
 }
@@ -548,6 +552,7 @@ STATIC void wlan_reenable (SlWlanMode_t mode) {
     // stop and start again
     sl_LockObjLock (&wlan_LockObj, SL_OS_WAIT_FOREVER);
     sl_Stop(SL_STOP_TIMEOUT);
+    wlan_initialize_data();
     wlan_obj.mode = sl_Start(0, 0, 0);
     sl_LockObjUnlock (&wlan_LockObj);
     ASSERT (wlan_obj.mode == mode);
@@ -801,10 +806,11 @@ STATIC mp_obj_t wlan_disconnect(mp_obj_t self_in) {
 STATIC MP_DEFINE_CONST_FUN_OBJ_1(wlan_disconnect_obj, wlan_disconnect);
 
 /// \method is_connected()
-/// Return true if connected to the AP and an IP address has been assigned. False otherwise.
+/// Return true if connected to the AP and an IP address has been assigned. Also true if there's any station connected.
+///        false otherwise.
 STATIC mp_obj_t wlan_isconnected(mp_obj_t self_in) {
-    if (GET_STATUS_BIT(wlan_obj.status, STATUS_BIT_CONNECTION) &&
-        GET_STATUS_BIT(wlan_obj.status, STATUS_BIT_IP_ACQUIRED)) {
+    if ((GET_STATUS_BIT(wlan_obj.status, STATUS_BIT_CONNECTION) &&
+         GET_STATUS_BIT(wlan_obj.status, STATUS_BIT_IP_ACQUIRED)) || (wlan_obj.staconnected > 0)) {
         return mp_const_true;
     }
     return mp_const_false;