9/11/2023 0 Comments Cron guru![]() ![]() This can be used as a simple mechanism for load balancing, or to avoid collisions, if you use a lot of devices. On any given device this number will always be the same for a field, but it will differ for different devices. The "H" wil be replaced with a consistent random number, that fits into that field. The character "H" can used in place of a number in any field of the cron. Hash (H) - consistent pseudo random number But in combination with a number, it can be used to execute on the last specific weekday of a month, like this: "0 0 12 ? * 1L" will execute at 12h on the last Monday of every month.Ĭan be used in combination with "W", as "LW", to execute on the last weekday of a month. In the day-of-week field "L" simply refers to Sunday. This executes on the 28th of January, on the 25th of 26th of February, and so on. You can also specify offsets from the last value, like this: "0 0 12 L-3 * ?". "0 0 12 L ?" will execute on the 31st of January, on the 28th or 29th (for leap years) of February, on the 31st of March, on the 30th of April, and so on. This is useful for the day-of-month field, as the last day of a month is dependent on the current month and year. ![]() Has a different meaning, depending on where you use it.Ī simple "L" means "the last of something". "H(6-9)W".Ĭan be used in combination with "L", but only as "LW", to execute on the last weekday of a month. "1W,15W".Ĭannot be used with ranges (dash, "-") or increments (slash "/").Ĭan be used in combination is hash ("H"), in the form "HW" or e.g. If you use "1W", and the first day of the month is a Saturday, it will execute on Monday the 3rd.Ĭan be used in combination with lists (comma ","), must be used for each individual value of the list you want to use it on, e.g. It will however never jump into another month. If the 15th is a Sunday, it will execute on 12h UTC on Monday the 16th. If the 15th is a Saturday, it will execute on 12h UTC on Friday the 14th. So "0 0 12 15W * *" will execute on 12h UTC of the 15th of a month, if that day is a Monday, Tuesday, Wednesday, Thursday, of Friday. This will execute on the nearest weekday (Monday to Friday) around that day. Used as a modifier added after a given day, e.g. The Wireless M-Bus Gateway support them in versions 0.15.4 and higher. In 2022 we introduced new features to our Cron Expressions that make them more flexible, but they will not work in older firmware. The following features are only supported in recent firmware. "1/3" in the day-of-month field means "fire every 3 days starting on the first day of the month". And "5/15" in the seconds field means "the seconds 5, 20, 35, and 50". For example, "0/15" in the seconds field means "0 and then every 15", that is "the seconds 0, 15, 30, and 45". For example, “MON,WED,FRI” in the day-of-week field means “the days Monday, Wednesday, and Friday”, "1,15" in the day-of-month field means "on the first and 15th of the month". Used to specify multiple explicit values. For example, “10-12” in the hour field means “the hours 10, 11 and 12”. See the examples below for clarification. For example, if I want my trigger to fire on a particular day of the month (say, the 10 th), but don’t care what day of the week that happens to be, I would put “10” in the day-of-month field, and “?” in the day-of-week field. Useful when you need to specify something in one of the two fields in which the character is allowed, but not the other. For example, "*" in the minute field means "every minute". Used to select all values within a field. If needed by your target application Lobaro can deliver on request special firmware support for keeping data acquisition intervals based on a real time clock (RTC) which stays in sync with the real time on your wrist. Times are relative to the random time when the device (re)starts or the batteries are inserted. For example it may be a important configuration parameter that a specific sensor data gets transmitted every 15 minutes, but it does not matter if the send out takes place on or. Some Lobaro nodes do not keep the real time internally since for many sensor applications it is enough to configure repetition intervals. ![]()
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