contiki - Thingsquare Router-Node -

i´m newbie thingsquare

i'm traying create ip64 gateway mb851 board (stm32w108cc microprocessor)

i send , receive data (ipv6 radio) using 2 mb851 boards thingsquare udp-multicast example.

i modified mist-mb851 platform include enc28j60-arch.c file implement platform code of spi functions called enc28j60 driver modified ip64-conf.h include enc28j60 driver , fallback interface

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include "ip64-eth-interface.h"                                        include "enc28j60-ip64-driver.h"                                      define ip64_conf_uip_fallback_interface ip64_eth_interface  define ip64_conf_input                  ip64_eth_interface_input  define ip64_conf_dhcp                   1  define ip64_conf_eth_driver             enc28j60_ip64_driver 

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i modified contiki/platform/mb851 include stm32 peripherallibs create spi driver

the enj28j60 driver tested

i compile thingsquare router-node example when initialize dhcp process

ip64_init();--->ip64_ipv4_dhcp_init();--->ip64_dhcpc_request();--->handle_dhcp();--->send_discover(); 

nothing happens

debugging code when tcpip_ipv6_output(); function call send packet function ip64_6to4(...); fails , don´t know why

best regards