Espressif ESP32-S2 Programming Manual page 550

Chapter 2. API Reference
ssl - SSL point
buffer - data buffer point
len - data length
Return:
> 0 : OK, and return received data bytes
= 0 : no data sent or connection is closed
< 0 : an error catch
Description:
send the data to remote
Example:
void example(void)
{
SSL *ssl;
char *buf;
int len;
int ret;
... ...
ret = SSL_write(ssl, buf, len);
}
3.10 SSL_CTX *SSL_get_SSL_CTX (const SSL * ssl)
Arguments:
ssl - SSL point
Return:
SSL context
Description:
get SSL context of the SSL
Example:
void example(void)
{
SSL *ssl;
SSL_CTX *ctx;
... ...
ctx = SSL_get_SSL_CTX(ssl);
}
3.11 int SSL_get_shutdown (const SSL * ssl)
Arguments:
ssl - SSL point
Return:
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