Android app - thingspeak - arduino | Arduino | Forum

Hi, i'm going to finish a project but i got stuck using an array sent from my Android app to Thingspeak (field 8) and then trying to get it from Arduino to assign data array to multiple variables.

So, from Android i send this URL : https://api.thingspeak.com/update.json?api_key=WRITE_API_KEY&field8=1,5,30,100,30,150,60,215,245 and it correctly saves it.

Now from my compatible Arduino board ( Wemos D1) i collect data from field 8 in this way

....
String alarmsList = ThingSpeak.readStringField(myChannelNumber, alarmsFieldNumber, myReadAPIKey);

int alarmsList_len = alarmsList.length() + 1;

int Allarmi[alarmsList_len];

alarmsList.toCharArray(Allarmi, alarmsList_len);

var_allarme_1 = alarmsList[0];
Serial.println(var_allarme_1);

but it doesn't work 🙁
Arduino IDE says:
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Arduino:1.8.9 (Windows 10), Scheda:"WeMos D1 R1, 80 MHz, Flash, Disabled, 4M (1M SPIFFS), v2 Lower Memory, Disabled, None, Only Sketch, 115200"
Name.ino: In function 'void loop()':
Name_1.0:187:49: error: no matching function for call to 'String::toCharArray(int [(((sizetype)(((ssizetype)alarmsList_len) + -1)) + 1)], int&)'
alarmsList.toCharArray(Allarmi, alarmsList_len);
^
In file included from C:\Users\jasnandrea\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.5.0\cores\esp8266/Arduino.h:261:0,
from sketch
ame.ino.cpp:1:
C:\Users\jasnandrea\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.5.0\cores\esp8266/WString.h:208:14: note: void String::toCharArray(char*, unsigned int, unsigned int) const
void toCharArray(char *buf, unsigned int bufsize, unsigned int index = 0) const {
^
C:\Users\jasnandrea\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.5.0\cores\esp8266/WString.h:208:14: note: no known conversion for argument 1 from 'int [(((sizetype)(((ssizetype)alarmsList_len) + -1)) + 1)]' to 'char*'
exit status 1
no matching function for call to 'String::toCharArray(int [(((sizetype)(((ssizetype)alarmsList_len) + -1)) + 1)], int
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Does anyone have any advice for me?