* fix empty inverters save on a brandnew ESP

* replaced several {0} by memset
* erase now erases the flash with 0xff (identical to a brandnew ESP)

tools/esp8266/app.cpp

@@ -353,8 +353,11 @@ void app::processPayload(bool retransmit) {
                 else {
                     mPayload[iv->id].complete = true;
                     iv->ts = mPayload[iv->id].ts;
-                    uint8_t payload[128] = {0};
+                    uint8_t payload[128];
                     uint8_t offs = 0;
+
+                    memset(payload, 0, 128);
+
                     for(uint8_t i = 0; i < (mPayload[iv->id].maxPackId); i ++) {
                         memcpy(&payload[offs], mPayload[iv->id].data[i], (mPayload[iv->id].len[i]));
                         offs += (mPayload[iv->id].len[i]);
@@ -903,8 +906,7 @@ void app::saveValues(void) {
     mEep->write(ADDR_CFG, (uint8_t*)&mConfig, CFG_LEN);
     Inverter<> *iv;
     for(uint8_t i = 0; i < MAX_NUM_INVERTERS; i ++) {
-        iv = mSys->getInverterByPos(i);
-        if(NULL != iv) {
+        iv = mSys->getInverterByPos(i, false);
         mEep->write(ADDR_INV_ADDR + (i * 8), iv->serial.u64);
         mEep->write(ADDR_INV_PWR_LIM + i * 2, iv->powerLimit[0]);
         mEep->write(ADDR_INV_PWR_LIM_CON + i * 2, iv->powerLimit[1]);
@@ -915,7 +917,6 @@ void app::saveValues(void) {
             mEep->write(ADDR_INV_CH_NAME + (i * 4 * MAX_NAME_LENGTH) + j * MAX_NAME_LENGTH, iv->chName[j], MAX_NAME_LENGTH);
         }
     }
-    }
 
     updateCrc();
     mEep->commit();

tools/esp8266/app.h

@@ -80,9 +80,10 @@ class app {
         }
 
         uint64_t Serial2u64(const char *val) {
-            char tmp[3] = {0};
+            char tmp[3];
             uint64_t ret = 0ULL;
             uint64_t u64;
+            memset(tmp, 0, 3);
             for(uint8_t i = 0; i < 6; i++) {
                 tmp[0] = val[i*2];
                 tmp[1] = val[i*2 + 1];
@@ -95,7 +96,7 @@ class app {
         }
 
         String getDateTimeStr(time_t t) {
-            char str[20] = {0};
+            char str[20];
             if(0 == t)
                 sprintf(str, "n/a");
             else
@@ -113,9 +114,11 @@ class app {
 
         void eraseSettings(bool all = false) {
             //DPRINTLN(DBG_VERBOSE, F("main.h:eraseSettings"));
-            uint8_t buf[64] = {0};
+            uint8_t buf[64];
             uint16_t addr = (all) ? ADDR_START : ADDR_START_SETTINGS;
             uint16_t end;
+
+            memset(buf, 0xff, 64);
             do {
                 end = addr + 64;
                 if(end > (ADDR_SETTINGS_CRC + 2))