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Possível problema com REJ em llread()
Quando se deteta erros no campo de dados (BCC deu errado), só deve ser enviado REJ se se tratar de uma nova trama. Quando a trama recebida é duplicada deve ser enviado RR.
Possível substituição nas linhas 454-465 de LinkLayer.c
`
if (destuffedFrame[destuffedSize-2] != BCC2) {
printf("ERROR in llread(): BCC2 error\n");
unsigned int seq = destuffedFrame[2] >> 6;
if (seq == linkLayer.sequenceNumber) { // nova trama
//Send Reject
if(seq == 0){
unsigned char C_REJ0 = (0 << 7) | C_REJ;
sendFrame(fd, A_SENDER, C_REJ0);
}
else if(seq == 1){
unsigned char C_REJ1 = (1 << 7) | C_REJ;
sendFrame(fd, A_SENDER, C_REJ1);
}
}
else { // trama duplicada
if(seq == 0){
int C_RR1 = (1 << 7) | C_RR;
sendFrame(fd, A_SENDER, C_RR1);
}
else if(seq == 1){
int C_RR0 = (0 << 7) | C_RR;
sendFrame(fd, A_SENDER, C_RR0);
}
}
}
`
Está melhor descrito na página 11 do guião.
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