tcpip_callback_msg struct

Free a callback message allocated by tcpip_callbackmsg_new(). @see tcpip_callbackmsg_new()

Try to post a callback-message to the tcpip_thread tcpip_mbox. @see tcpip_callbackmsg_new()

Try to post a callback-message to the tcpip_thread mbox. Same as tcpip_callbackmsg_trycallback but calls sys_mbox_trypost_fromisr(), mainly to help FreeRTOS, where calls differ between task level and ISR level. @see tcpip_callbackmsg_new()