How to properly send elapsedMillis via Wire/I2C?

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i have project @ house connects 2 arduinos. have master, has sensor attached it, , sends sensor data slave. however, wanted send time , in milliseconds, takes send message via i2c. managed it, can't send via i2c.

if try send elapsedmillis int, -1 result. other classes wont work.

what proper way it?

millisecons, or better, return of function millis() unsigned long. how "change" type of variable int? maybe problem! can post code?


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