AT+CIPSTART="TCP","sheets.googleapis.com",80
AT+CIPSEND=462
POST /v4/spreadsheets/1IIUYggTRVpAvd6cuqt38HODdUFKVMntZqtYdDxZKlw8/values/ROBOT!A1:D5?valueInputOption=USER_ENTERED
Host: sheets.googleapis.com
Content-Length: 269
Content-Type: text/xml
{"range": "Sheet1!A1:D5","majorDimension": "ROWS","values": [["Item", "Cost", "Stocked", "Ship Date"],["Wheel", "$20.50", "4", "3/1/2016"],["Door", "$15", "2", "3/15/2016"],["Engine", "$100", "1", "30/20/2016"],["Totals", "=SUM(B2:B4)", "=SUM(C2:C4)", "=MAX(D2:D4)"]],}