net.mbedtls: support compiling with `-d mbedtls_client_read_timeout_m…

…s=7000`, `-d mbedtls_server_read_timeout_ms=60000`, and `-d trace_mbedtls_timeouts`

vlib/net/mbedtls/ssl_connection.c.v

@@ -8,6 +8,9 @@ const ctr_drbg = C.mbedtls_ctr_drbg_context{}
 
 const entropy = C.mbedtls_entropy_context{}
 
+const mbedtls_client_read_timeout_ms = $d('mbedtls_client_read_timeout_ms', 550)
+const mbedtls_server_read_timeout_ms = $d('mbedtls_server_read_timeout_ms', 41_000)
+
 fn init() {
 	$if trace_ssl ? {
 		eprintln(@METHOD)
@@ -176,7 +179,10 @@ fn (mut l SSLListener) init() ! {
 	C.mbedtls_net_init(&l.server_fd)
 	C.mbedtls_ssl_init(&l.ssl)
 	C.mbedtls_ssl_config_init(&l.conf)
-	C.mbedtls_ssl_conf_read_timeout(&l.conf, 41_000)
+	$if trace_mbedtls_timeouts ? {
+		dump(mbedtls_server_read_timeout_ms)
+	}
+	C.mbedtls_ssl_conf_read_timeout(&l.conf, mbedtls_server_read_timeout_ms)
 	l.certs = &SSLCerts{}
 	C.mbedtls_x509_crt_init(&l.certs.client_cert)
 	C.mbedtls_pk_init(&l.certs.client_key)
@@ -371,7 +377,10 @@ fn (mut s SSLConn) init() ! {
 	if ret != 0 {
 		return error_with_code('Failed to set SSL configuration', ret)
 	}
-	C.mbedtls_ssl_conf_read_timeout(&s.conf, 550)
+	$if trace_mbedtls_timeouts ? {
+		dump(mbedtls_client_read_timeout_ms)
+	}
+	C.mbedtls_ssl_conf_read_timeout(&s.conf, mbedtls_client_read_timeout_ms)
 
 	unsafe {
 		C.mbedtls_ssl_conf_rng(&s.conf, C.mbedtls_ctr_drbg_random, &ctr_drbg)