I forgot the bdpu_body structure modification in the last message, sorry here it
is :
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typedef struct
{
bpdu_flag flags;
bridge_id root_id[8];
unsigned char root_path_cost[4];
bridge_id bridge_id[8];
unsigned char port_id[2];
unsigned char message_age[2];
unsigned char max_age[2];
unsigned char hello_time[2];
unsigned char forward_delay[2];
} bpdu_body;
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