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bmp280's Issues

start_link returns ok even if I2C fails

I saw this in the Neves Livebook when no sensor is connected.

Screen Shot 2021-05-11 at 11 07 35 PM

This happens because we initialize the sensor in handle_continue. The error followed by {:ok, pid} result is a little confusing from the library user perspective, but I guess it is a matter of our design decision.

|> init_sensor()

If we initialize the sensor in init callback not in handle_continue, we can return :error in case something goes wrong in the sensor initialization but then caller process would need to wait until the whole initialization gets completed.

To me personally from users perspective, I prefer to return {:error, reason} over always return {:ok, pid} unless initialization is painfully slow.

  • Maybe it is OK and acceptable as a feature in favor of quick initialization? ๐Ÿค”
  • Maybe we can at least raise descriptive custom error message instead of the generic match error

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