ESP8266: sets hardcoded country code(CC) policy to track AP's CC

components/wifi/esp8266-driver/ESP8266/ESP8266.cpp

@@ -1201,4 +1201,29 @@ nsapi_connection_status_t ESP8266::connection_status() const
 {
     return _conn_status;
 }
+
+bool ESP8266::set_country_code_policy(bool track_ap, const char *country_code, int channel_start, int channels)
+{
+    int t_ap = track_ap ? 0 : 1;
+
+    _smutex.lock();
+    bool done = _parser.send("AT+CWCOUNTRY_DEF=%d,\"%s\",%d,%d", t_ap, country_code, channel_start, channels)
+                && _parser.recv("OK\n");
+
+    if (!done) {
+        tr_error("\"AT+CWCOUNTRY_DEF=%d,\"%s\",%d,%d\" - FAIL", t_ap, country_code, channel_start, channels);
+    }
+
+    done &= _parser.send("AT+CWCOUNTRY_CUR=%d,\"%s\",%d,%d", t_ap, country_code, channel_start, channels)
+                    && _parser.recv("OK\n");
+
+    if (!done) {
+        tr_error("\"AT+CWCOUNTRY_CUR=%d,\"%s\",%d,%d\" - FAIL", t_ap, country_code, channel_start, channels);
+    }
+
+    _smutex.unlock();
+
+    return done;
+}
+
 #endif

components/wifi/esp8266-driver/ESP8266/ESP8266.h

@@ -335,6 +335,15 @@ public:
      */
     bool set_default_wifi_mode(const int8_t mode);
 
+    /**
+     * @param track_ap      if TRUE, sets the county code to be the same as the AP's that ESP is connected to,
+     *                      if FALSE the code will not change
+     * @param country_code  ISO 3166-1 Alpha-2 coded country code
+     * @param channel_start the channel number to start at
+     * @param channels      number of channels
+     */
+    bool set_country_code_policy(bool track_ap, const char *country_code, int channel_start, int channels);
+
     /** Get the connection status
      *
      *  @return         The connection status according to ConnectionStatusType

components/wifi/esp8266-driver/ESP8266Interface.cpp

@@ -68,6 +68,7 @@ ESP8266Interface::ESP8266Interface()
     memset(_cbs, 0, sizeof(_cbs));
     memset(ap_ssid, 0, sizeof(ap_ssid));
     memset(ap_pass, 0, sizeof(ap_pass));
+    memset(_country_code, 0, sizeof(_country_code));
 
     _esp.sigio(this, &ESP8266Interface::event);
     _esp.set_timeout();
@@ -97,6 +98,7 @@ ESP8266Interface::ESP8266Interface(PinName tx, PinName rx, bool debug, PinName r
     memset(_cbs, 0, sizeof(_cbs));
     memset(ap_ssid, 0, sizeof(ap_ssid));
     memset(ap_pass, 0, sizeof(ap_pass));
+    memset(_country_code, 0, sizeof(_country_code));
 
     _esp.sigio(this, &ESP8266Interface::event);
     _esp.set_timeout();
@@ -391,7 +393,15 @@ bool ESP8266Interface::_get_firmware_ok()
 
 nsapi_error_t ESP8266Interface::_init(void)
 {
+
+
     if (!_initialized) {
+
+        if (!_country_code[0] || !_country_code[1] ) {
+            strncpy(_country_code, MBED_CONF_ESP8266_COUNTRY_CODE, 2);
+            _country_code[2] = '\0';
+        }
+
         if (_reset() != NSAPI_ERROR_OK) {
             return NSAPI_ERROR_DEVICE_ERROR;
         }
@@ -407,6 +417,9 @@ nsapi_error_t ESP8266Interface::_init(void)
         if (!_esp.set_default_wifi_mode(ESP8266::WIFIMODE_STATION)) {
             return NSAPI_ERROR_DEVICE_ERROR;
         }
+        if (!_esp.set_country_code_policy(true, _country_code, MBED_CONF_ESP8266_CHANNEL_START, MBED_CONF_ESP8266_CHANNELS)) {
+            return NSAPI_ERROR_DEVICE_ERROR;
+        }
         if (!_esp.cond_enable_tcp_passive_mode()) {
             return NSAPI_ERROR_DEVICE_ERROR;
         }

components/wifi/esp8266-driver/ESP8266Interface.h

@@ -44,6 +44,18 @@
 #endif
 #endif /* TARGET_FF_ARDUINO */
 
+#ifndef MBED_CONF_ESP8266_COUNTRY_CODE
+#define MBED_CONF_ESP8266_COUNTRY_CODE "CN"
+#endif
+
+#ifndef MBED_CONF_ESP8266_CHANNEL_START
+#define MBED_CONF_ESP8266_CHANNEL_START 1
+#endif
+
+#ifndef MBED_CONF_ESP8266_CHANNELS
+#define MBED_CONF_ESP8266_CHANNELS 13
+#endif
+
 /** ESP8266Interface class
  *  Implementation of the NetworkStack for the ESP8266
  */
@@ -350,6 +362,9 @@ private:
     char ap_pass[ESP8266_PASSPHRASE_MAX_LENGTH + 1]; /* The longest possible passphrase; +1 for the \0 */
     nsapi_security_t _ap_sec;
 
+    // Country code
+    char _country_code[3]; /* ISO 3166-1 Alpha-2 coded country code plus, +1 for the \0 */
+
     bool _if_blocking; // NetworkInterface, blocking or not
     rtos::ConditionVariable _if_connected;