TinyGsmNTP

[capedra]

TimeZone from NTPServerSync function shouldn't be byte/unsigned char, because the range is (-47 to 48) according to the AT command manual.

Also, the CNTPCID of this same function should be changed as well if you don't want to face "63 Connection Error" or "61 Network Error":

thisModem().sendAT(GF("+CNTPCID=0"));