diff --git a/platformio.ini b/platformio.ini
index 2fa1355..1ae92e8 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -10,8 +10,8 @@
 
 [env:nodemcu]
 ;platform = https://github.com/platformio/platform-espressif8266.git#feature/stage
-platform = https://github.com/platformio/platform-espressif8266.git
-;platform = espressif8266
+;platform = https://github.com/platformio/platform-espressif8266.git
+platform = espressif8266@1.7.3
 board = nodemcu
 framework = arduino
 board_build.f_cpu = 80000000L
diff --git a/src/main.cpp b/src/main.cpp
index 52bede2..c163a20 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -144,15 +144,17 @@ void inline lightsleep() {
   wifi_fpm_set_sleep_type(LIGHT_SLEEP_T);
   wifi_fpm_open(); // Enables force sleep
   GPIO_DIS_OUTPUT(GPIO_ID_PIN(GEIGER_PIN));
-  PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTCK_U,FUNC_GPIO13); // PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTDI_U,FUNC_GPIO13);
+  //PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTCK_U,FUNC_GPIO13);
+  PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTDI_U,FUNC_GPIO13);
   gpio_pin_wakeup_enable(GPIO_ID_PIN(GEIGER_PIN), GPIO_PIN_INTR_LOLEVEL);
   wifi_fpm_set_wakeup_cb(fpm_wakup_cb_func1);
   Serial.flush();
+  delay(1);
   wifi_fpm_do_sleep(0xFFFFFFF); // Sleep for longest possible time // this does not work: (uint32_t)postingInterval*1000
   delay(1); // go to sleep now
   DEBUG_MSG("[DEBUG] woken\n");
-  //wifi_fpm_do_wakeup();
-  wifi_fpm_close();
+  //wifi_fpm_do_wakeup(); // wake from modem sleep
+  wifi_fpm_close();  // disable force sleep function
 }
 
 void ICACHE_FLASH_ATTR getValuesJSON(char* buffer, const size_t buf_len, int format) {
@@ -379,7 +381,9 @@ void ICACHE_FLASH_ATTR sendValues() {
 
   }
 
+  #if ESP_SDK_VERSION_NUMBER >= 0x020200
   net.setInsecure();
+  #endif
   mqttclient.begin(mqttserver, 8883, net);
   constexpr unsigned int retry_delay = 500;
   for (int tries=0; tries<5 && !mqttclient.connect(mqttusername, mqttusername, mqttpassword); tries++ ) {
diff --git a/src/main.h b/src/main.h
index 9f15701..40c1f70 100644
--- a/src/main.h
+++ b/src/main.h
@@ -7,6 +7,6 @@
   #define DEBUG_MSG(...)
 #endif
 
-#define FW_VERSION 39
+#define FW_VERSION 41
 
 #endif /* _MAIN_H */