B21S: Bluetooth prints empty labels

[etaloncop]

I extended the timeout in the print_image function because my labels were cut off, and got it working alright over USB, however when I communicate with the device over bluetooth the printer will spit out one label just without any content.

logs:

python main.py -i examples/B21_30x15mm_240x120px.png  -d 1  -m b21 -c bluetooth  -a 03:06:26:07:00:87 -v
DEBUG | PngImagePlugin:call:197 - STREAM b'IHDR' 16 13
DEBUG | PngImagePlugin:call:197 - STREAM b'pHYs' 41 9
DEBUG | PngImagePlugin:call:197 - STREAM b'IDAT' 62 5054
DEBUG | printer:_log_buffer:146 - send: 55:55:21:01:01:21:aa:aa
DEBUG | printer:_log_buffer:146 - recv: 55:55:31:01:01:31:aa:aa
DEBUG | printer:_log_buffer:146 - send: 55:55:23:01:01:23:aa:aa
DEBUG | printer:_log_buffer:146 - recv: 55:55:33:01:01:33:aa:aa
DEBUG | printer:_log_buffer:146 - send: 55:55:01:01:01:01:aa:aa
DEBUG | printer:_log_buffer:146 - recv: 55:55:02:01:01:02:aa:aa
DEBUG | printer:_log_buffer:146 - send: 55:55:03:01:01:03:aa:aa
DEBUG | printer:_log_buffer:146 - recv: 55:55:04:01:01:04:aa:aa
DEBUG | printer:_log_buffer:146 - send: 55:55:13:04:00:78:00:f0:9f:aa:aa
DEBUG | printer:_log_buffer:146 - recv: 55:55:14:02:01:00:17:aa:aa
DEBUG | printer:_log_buffer:146 - send: 55:55:e3:01:01:e3:aa:aa
DEBUG | printer:_log_buffer:146 - recv: 55:55:d3:03:00:77:01:a6:aa:aa
DEBUG | printer:_log_buffer:146 - recv: 55:55:e4:01:01:e4:aa:aa
DEBUG | printer:_log_buffer:146 - send: 55:55:f3:01:01:f3:aa:aa
DEBUG | printer:_log_buffer:146 - recv: 55:55:f4:01:01:f4:aa:aa

[etaloncop]

Fixed after looking at #17
The set dimensions needs to be passed 3 integers (the third being a quantity)