sender.py: updates to send_test_(D3S_)packet
sender.py: updates to send_test_(D3S_)packet

tybtab/dosenet-raspberrypi,cllamb0/dosenet-raspberrypi,tybtab/dosenet-raspberrypi,yarocoder/dosenet-raspberrypi,yarocoder/dosenet-raspberrypi,bearing/dosenet-raspberrypi,bearing/dosenet-raspberrypi,cllamb0/dosenet-raspberrypi