OSError: [Errno 121] Remote I/O error about luma.core HOT 8 CLOSED

That is the error I would expect smbus to throw because there is nothing at the 'remote' address (whatever the value in self._addr is). Are you suggesting that this should be wrapped/captured & rethrown in a luma.core.error instead?

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It's very similar to #5 (same code path) but a different error. I suggest we catch them and throw appropriate core.errors. This is what luma.core is for imo, make it easier.

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@rm-hull so this is basically (always) a DeviceAddressError?

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@kplindegaard any idea how we should treat this error?

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@thijstriemstra I haven't really put much emphasis on catching anything from ioctl and possible exceptions it may throw if it's unable to perform the prescribed action as you understand. But yeah, this is typically what you experience when there is no device present on that given i2c address. I mean, I have sent illegal buffers totally unrecognizable for the slave device, but that's a different story. Whereas this is "device not available on this address" type issue.

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Thanks for the feedback @kplindegaard!

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Added serial-error branch and output is now:

$ python examples/3d_box.py -i i2c --display sh1106
usage: 3d_box.py [-h] [--config CONFIG]
                 [--display {ssd1306,ssd1322,ssd1325,ssd1331,sh1106,pcd8544,st7735,max7219,neopixel}]
                 [--width WIDTH] [--height HEIGHT] [--rotate {0,1,2,3}]
                 [--interface {i2c,spi}] [--i2c-port I2C_PORT]
                 [--i2c-address I2C_ADDRESS] [--spi-port SPI_PORT]
                 [--spi-device SPI_DEVICE] [--spi-bus-speed SPI_BUS_SPEED]
                 [--bcm-data-command BCM_DATA_COMMAND] [--bcm-reset BCM_RESET]
                 [--bcm-backlight BCM_BACKLIGHT]
                 [--block-orientation {horizontal,vertical}]
                 [--mode {1,RGB,RGBA}]
                 [--framebuffer {diff_to_previous,full_frame}]
                 [--bgr {True,False}]
3d_box.py: error: I2C device not found on address: 60

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fixed since 0.5.2

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