Adapt WSS to new boards and use MQTT domain for eSIM connectivity

Preserve main GNSS and volume behavior while porting verified TLS, receive fixes and full-handshake optimizations. Add MQTT connection diagnostics and route MQTT through banban.api.talkingq.com:1883.

Include migration documentation and regression tools. Firmware builds and package checks passed; user confirmed new-board connectivity after switching the MQTT host to the domain.

ql-kernel/threadx/quec_mbedtls/x509.c

@@ -959,14 +959,16 @@ int mbedtls_x509_key_size_helper(char *buf, size_t buf_size, const char *name)
  * Set the time structure to the current time.
  * Return 0 on success, non-zero on failure.
  */
-#ifdef QUECTEL_MBEDTLS_SUPPORT
+#if defined(QUECTEL_MBEDTLS_SUPPORT) && !defined(TALKINGQ_TLS_USE_RTC_TIME)
 #include "utlTime.h"
 #include "saremo_RTC.h"
 extern void GetCurrentCompTime(TIME *con_time);
 #endif/*QUECTEL_MBEDTLS_SUPPORT*/
 static int x509_get_current_time(mbedtls_x509_time *now)
 {
-#ifdef QUECTEL_MBEDTLS_SUPPORT
+/* OpenCPU's GetCurrentCompTime is an empty shim. The shared TLS profile uses
+ * mbedtls_time (SDK RTC) and UTC conversion below instead. */
+#if defined(QUECTEL_MBEDTLS_SUPPORT) && !defined(TALKINGQ_TLS_USE_RTC_TIME)
 	TIME end_time = {0};
 	GetCurrentCompTime(&end_time);
 	now->year = end_time.year;