ESP-TLS: esp_tls_conn_new_sync cannot open non-TLS connection (IDFGH-13865)

[aenima1891]

Answers checklist.

• I have read the documentation ESP-IDF Programming Guide and the issue is not addressed there.
• I have updated my IDF branch (master or release) to the latest version and checked that the issue is present there.
• I have searched the issue tracker for a similar issue and not found a similar issue.

General issue report

I'm using ESP-IDF v5.3.1
In esp_tsl.h there is the esp_tls_conn_new_sync function

`/**

• @brief Create a new blocking TLS/SSL connection
• This function establishes a TLS/SSL connection with the specified host in blocking manner.
• @param[in] hostname Hostname of the host.
• @param[in] hostlen Length of hostname.
• @param[in] port Port number of the host.
• @param[in] cfg TLS configuration as esp_tls_cfg_t. If you wish to open
• non-TLS connection, keep this NULL. For TLS connection,
• a pass pointer to esp_tls_cfg_t. At a minimum, this
• structure should be zero-initialized.
• @param[in] tls Pointer to esp-tls as esp-tls handle.
• @return
• -1 If connection establishment fails.
• 1 If connection establishment is successful.
• 0 If connection state is in progress.
  */
  int esp_tls_conn_new_sync(const char *hostname, int hostlen, int port, const esp_tls_cfg_t *cfg, esp_tls_t *tls);
  `

if I pass a cfg=NULL param, the function return -1.
In fact, the function implementation is

int esp_tls_conn_new_sync(const char *hostname, int hostlen, int port, const esp_tls_cfg_t *cfg, esp_tls_t *tls)
{
if (!cfg || !tls || !hostname || hostlen < 0) {
return -1;
}
uint64_t start_time_us;
start_time_us = esp_tls_get_platform_time();
...

There is a mismatch between the header doc and the func implementation.