Use printf format strings from PROGMEM

Author: rob040

TODO.txt

@@ -81,7 +81,7 @@ TODO items
 20.9  Add wide clock style config, different screen formats for 8+ tiles: HH:MM, HH:MM:SS, HH:MM *CF, HH:MM %RH, mm dd HH:MM,  HH:MM Www DD (12 chars! 8 tiles fit 10 chars! ,
       (There are smaller fonts, but everything in this code is assuming fixed size chars.)
       ==> Done v3.1.25; now there are 8 variants. No font change.
-21. News headlines: Do not use newsapi.org, it is NOT free but costs 450 USD per __MONTH__ (5400 USD per annum)! rediculous pricing for this Indian company!
+21. News headlines: Do not use newsapi.org, it is NOT free but costs 450 USD per __MONTH__ (5400 USD per annum)! ridiculous pricing for this Indian company!
     ==> Done v3.1.26
 22. Change to use latest Arduino json V7 library. this makes the JsonStreamingParser and json buffer size (mis)calculation unnecessary.
     ==> Done v3.1.27  (thanks to bit4man)

marquee/MqttClient.cpp

@@ -72,15 +72,15 @@ void MqttClient::loop() {
     if (connectstatus) {
       failMessage[0] = 0;
       if (!client.subscribe(topic)) {
-        sprintf(failMessage, "Failed to connect to topic:%s", topic);
+        sprintf_P(failMessage, PSTR("Failed to connect to topic:%s"), topic);
       } else {
         // publish on topic + "/ready" the time to signal MQTT we are there
         String pubtopic = topic;
         pubtopic += "/ready";
         client.publish(pubtopic.c_str(), "ready");
       }
     } else {
-      sprintf(failMessage, "Failed to connect to: %s:%d, reason: %d", server, port, client.state());
+      sprintf_P(failMessage, PSTR("Failed to connect to: %s:%d, reason: %d"), server, port, client.state());
     }
   }
   if (client.connected()) {

marquee/marquee.ino

@@ -1158,7 +1158,7 @@ void getWeatherData() //client function to send/receive GET request data.
 // when scrolling the display causing that to stall.
 // Solution: cancel setup sync provider, and call getNtpTime() here explicitly,
 // then the time update is visualized on the LED display.
-Serial.printf("Timestatus=%d\n", timeStatus());  // status timeNeedsSync(1) is NEVER set
+Serial.printf_P(PSTR("Timestatus=%d\n"), timeStatus());  // status timeNeedsSync(1) is NEVER set
   if (1) { //ALWAYS;   (timeStatus() != timeSet || updateTime) { // when timeNotSet OR timeNeedsSync
     Serial.println(F("Updating Time..."));
     //Update the Time