{"text_format":"3","workbook":"xls","n_sheets":1,"sheets":["sheet"],"read":"whole","date_system":"1900","formulas":"cached_only"}

{"sheet":"sheet","index":0,"n_rows":1,"n_cols":10,"rows_kept":1,"flags":["formulas_cached_only"]}
["id","device_name","device_id","device_type","device_location","loop_detail","gateway_code","gateway_ip","usage","status"]