save ram, move constants to flash

src/main.cpp

@@ -29,12 +29,12 @@ extern "C" {
 #include "main.h"
 #include "passwords.h"
 
-const char* server = "ingress.opensensemap.org";
+const char* server PROGMEM = "ingress.opensensemap.org";
 
 #define MQTT_MAX_PACKET_SIZE 512
-const char* mqttserver = "home.xd0.de";
-const char* mqttusername = "esp-weatherstation";
-const char* mqttpassword = PWD_MQTT;
+const char* mqttserver PROGMEM = "home.xd0.de";
+const char* mqttusername PROGMEM = "esp-weatherstation";
+const char* mqttpassword PROGMEM = PWD_MQTT;
 
 constexpr unsigned int postingInterval = 60000; //Uploadintervall in Millisekunden
 constexpr unsigned int dhcp_interval = 60*60*1000;
@@ -121,7 +121,7 @@ unsigned long rtcMillis() {
   return ((uint64_t)(rtc_t*(uint64_t)cal) >> 12)/1000;
 }
 
-void fpm_wakup_cb_func1(void) {
+void ICACHE_RAM_ATTR fpm_wakup_cb_func1(void) {
   //gpio_pin_wakeup_disable();
   //ESP.wdtFeed();
   //wifi_fpm_do_wakeup();
@@ -129,7 +129,7 @@ void fpm_wakup_cb_func1(void) {
   geiger_counts++;
 }
 
-void lightsleep() {
+void inline lightsleep() {
   ESP.wdtFeed();
   wifi_station_disconnect();
   wifi_set_opmode(NULL_MODE);