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common/stm32_nucleo/networking/TmTcLwIpUdpBridge.h

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+#ifndef BSP_STM32_RTEMS_NETWORKING_TMTCUDPBRIDGE_H_
+#define BSP_STM32_RTEMS_NETWORKING_TMTCUDPBRIDGE_H_
+
+#include <fsfw/tmtcservices/TmTcBridge.h>
+
+#include <lwip/udp.h>
+#include <lwip/ip_addr.h>
+
+#define TCPIP_RECV_WIRETAPPING 0
+
+/**
+ * This bridge is used to forward TMTC packets received via LwIP UDP to the internal software bus.
+ */
+class TmTcLwIpUdpBridge : public TmTcBridge {
+    friend class UdpTcLwIpPollingTask;
+public:
+    TmTcLwIpUdpBridge(object_id_t objectId,
+            object_id_t ccsdsPacketDistributor, object_id_t tmStoreId,
+            object_id_t tcStoreId);
+    virtual ~TmTcLwIpUdpBridge();
+
+    virtual ReturnValue_t initialize() override;
+    ReturnValue_t udp_server_init();
+
+    /**
+     * In addition to default implementation, ethernet link status is checked.
+     * @param operationCode
+     * @return
+     */
+    virtual ReturnValue_t performOperation(uint8_t operationCode = 0) override;
+
+    /** TM Send implementation uses udp_send function from lwIP stack
+     * @param data
+     * @param dataLen
+     * @return
+     */
+    virtual ReturnValue_t sendTm(const uint8_t * data, size_t dataLen) override;
+
+    /**
+     * @brief This function is called when an UDP datagram has been
+     * received on the port UDP_PORT.
+     * @param arg
+     * @param upcb_
+     * @param p
+     * @param addr Source address which will be bound to TmTcUdpBridge::lastAdd
+     * @param port
+     */
+    static void udp_server_receive_callback(void *arg,
+            struct udp_pcb *upcb_, struct pbuf *p, const ip_addr_t *addr,
+            u16_t port);
+
+    /**
+     * Check whether the communication link is up.
+     * Caller must ensure thread-safety by using the bridge lock.
+     * @return
+     */
+    bool comLinkUp() const;
+
+private:
+    struct udp_pcb *upcb = nullptr;
+    ip_addr_t lastAdd;
+    u16_t lastPort = 0;
+    bool physicalConnection = false;
+    MutexIF* bridgeLock = nullptr;
+
+#if TCPIP_RECV_WIRETAPPING == 1
+    bool connectFlag = false;
+#endif
+
+    /**
+     * Used to notify bridge about change in the physical ethernet connection.
+     * Connection does not mean that replies are possible (recipient not set yet), but
+     * disconnect means that we can't send anything. Caller must ensure thread-safety
+     * by using the bridge lock.
+     */
+    void physicalConnectStatusChange(bool connect);
+};
+
+#endif /* BSP_STM32_RTEMS_NETWORKING_TMTCUDPBRIDGE_H_ */