Fix WiFiStation buffer management

Author: pennam

libraries/ESPhost/src/CEspCommunication.cpp

@@ -137,6 +137,15 @@ bool CEspCom::getMsgForStation(CMsg &msg) {
    return false;
 }
 
+/* -------------------------------------------------------------------------- */
+int CEspCom::peekMsgSizeForStation() {
+/* -------------------------------------------------------------------------- */
+   if(CEspCom::rxStationQueue.size() > 0) {
+      return CEspCom::rxStationQueue.front().get_size();
+   }
+   return 0;
+}
+
 /* -------------------------------------------------------------------------- */
 bool CEspCom::getMsgForSoftAp(CMsg &msg) {
 /* -------------------------------------------------------------------------- */

libraries/ESPhost/src/CEspCommunication.h

@@ -60,6 +60,7 @@ class CEspCom {
    static bool storeStationMsg(CMsg &msg);
    static bool storeSoftApMsg(CMsg &msg); 
    static bool getMsgForStation(CMsg &msg);
+   static int  peekMsgSizeForStation();
    static bool getMsgForSoftAp(CMsg &msg);
 
    static void clearStationRx();

libraries/ESPhost/src/CEspControl.cpp

@@ -68,12 +68,11 @@ int CEspControl::process_test_messages(CCtrlMsgWrapper* response) {
    return 0;
 }
 
-
 /* -------------------------------------------------------------------------- */
 uint8_t *CEspControl::getStationRx(uint8_t &if_num, uint16_t &dim) {
 /* -------------------------------------------------------------------------- */   
    uint8_t *rv = nullptr;
-   CMsg msg; 
+   CMsg msg;
    __disable_irq();
    bool res = CEspCom::getMsgForStation(msg);
    if(!res) {
@@ -91,6 +90,16 @@ uint8_t *CEspControl::getStationRx(uint8_t &if_num, uint16_t &dim) {
    return rv;
 }
 
+/* -------------------------------------------------------------------------- */
+uint16_t CEspControl::peekStationRxMsgSize() {
+/* -------------------------------------------------------------------------- */
+   uint16_t res;
+   __disable_irq();
+   res = CEspCom::peekMsgSizeForStation();
+   __enable_irq();
+   return res;
+}
+
 /* -------------------------------------------------------------------------- */
 uint8_t *CEspControl::getSoftApRx(uint8_t &if_num, uint16_t &dim) {
 /* -------------------------------------------------------------------------- */   

libraries/ESPhost/src/CEspControl.h

@@ -137,6 +137,7 @@ class CEspControl {
    int sendBuffer(ESP_INTERFACE_TYPE type, uint8_t num, uint8_t *buf, uint16_t dim);
 
    uint8_t *getStationRx(uint8_t &if_num, uint16_t &dim);
+   uint16_t peekStationRxMsgSize();
    uint8_t *getSoftApRx(uint8_t &if_num, uint16_t &dim);
 
 

libraries/lwIpWrapper/src/CNetIf.cpp

@@ -1374,27 +1374,28 @@ void CWifiStation::task()
     /* -------------------------------------------------------------------------- */
     /* get messages and process it  */
     uint8_t if_num;
-    uint16_t dim;
+    uint16_t dim = 0;
     uint8_t* buf = nullptr;
+    struct pbuf* p = nullptr;
+
     /* shall we verify something about if_num??? */
     do {
-        buf = CEspControl::getInstance().getStationRx(if_num, dim);
-
-        if (buf != nullptr) {
-            // Serial.println("Wifi Station - msg rx");
-
-            struct pbuf* p = pbuf_alloc(PBUF_RAW, dim, PBUF_RAM);
-            if (p != NULL) {
+        dim = CEspControl::getInstance().peekStationRxMsgSize();
+        if (dim > 0)
+        {
+            p = pbuf_alloc(PBUF_RAW, dim, PBUF_RAM);
+            if (p != nullptr)
+            {
+                buf = CEspControl::getInstance().getStationRx(if_num, dim);
                 /* Copy ethernet frame into pbuf */
                 pbuf_take((struct pbuf*)p, (uint8_t*)buf, (uint32_t)dim);
-                delete[] buf;
-
                 if (ni.input(p, &ni) != ERR_OK) {
                     pbuf_free(p);
                 }
+                delete[] buf;
             }
         }
-    } while(buf != nullptr);
+    } while(dim > 0 && p != nullptr);
 
 
 #if LWIP_DHCP