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coap_session.c: Fix token generation when no token is provided #1904

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coap_session.c: Fix token generation when no token is provided #1904

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14 changes: 9 additions & 5 deletions src/coap_session.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2258,11 +2258,15 @@ void
coap_session_init_token(coap_session_t *session, size_t len,
const uint8_t *data) {
session->tx_token = coap_decode_var_bytes8(data, len);
/*
* Decrement as when first used by coap_session_new_token() it will
* get incremented
*/
session->tx_token--;
if (session->tx_token > 0) {
/*
* If the token was populated from coap-client CLI option (-T) decrement it here as
* when first used by coap_session_new_token() it will get incremented.
* As 0 is a special value for empty token (Token Length = 0) we want to avoid
* starting at -1.
*/
session->tx_token--;
}
}

void
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