+/**
+ * Allocate a structure for a static callback message and initialize it.
+ * This is intended to be used to send "static" messages from interrupt context.
+ *
+ * @param function the function to call
+ * @param ctx parameter passed to function
+ * @return a struct pointer to pass to tcpip_trycallback().
+ */
+struct tcpip_callback_msg* tcpip_callbackmsg_new(tcpip_callback_fn function, void *ctx)
+{
+ struct tcpip_msg *msg = (struct tcpip_msg *)memp_malloc(MEMP_TCPIP_MSG_API);
+ if (msg == NULL) {
+ return NULL;
+ }
+ msg->type = TCPIP_MSG_CALLBACK_STATIC;
+ msg->msg.cb.function = function;
+ msg->msg.cb.ctx = ctx;
+ return (struct tcpip_callback_msg*)msg;
+}
+
+/**
+ * Free a callback message allocated by tcpip_callbackmsg_new().
+ *
+ * @param msg the message to free
+ */
+void tcpip_callbackmsg_delete(struct tcpip_callback_msg* msg)
+{
+ memp_free(MEMP_TCPIP_MSG_API, msg);
+}
+
+/**
+ * Try to post a callback-message to the tcpip_thread mbox
+ * This is intended to be used to send "static" messages from interrupt context.
+ *
+ * @param msg pointer to the message to post
+ * @return sys_mbox_trypost() return code
+ */
+err_t
+tcpip_trycallback(struct tcpip_callback_msg* msg)
+{
+ if (!sys_mbox_valid(&mbox)) {
+ return ERR_VAL;
+ }
+ return sys_mbox_trypost(&mbox, msg);
+}
+