Goal: Send a command through a serial port to a mote to make it send a 6P packet.
Usually, we would get this working by using the command line of OpenVisualizer:
- set /dev/myAwesomeMote 6pAdd [6,7]
This would send the following bytes over the serial bus towards the mote:
- [67, 9, 2, 6, 7] in decimal
Explanation:
- 67 indicates the char 'C', the mote can recognize this is a command, rather a packet send to mote. https://github.com/openwsn-berkeley/openwsn-sw/blob/develop/software/openvisualizer/openvisualizer/moteConnector/OpenParser.py#L22
- 9 is the commandId for 6pAdd https://github.com/openwsn-berkeley/openwsn-sw/blob/develop/software/openvisualizer/openvisualizer/moteState/moteState.py#L416
- 2 is the length of the payload of 6pAdd command (in bytes)
- 6 and 7 are the data.
Now we are going to send it over a ZMQ socket:
#!/usr/bin/env python
import zmq
d = {"signal": "cmdToMote",
"data": {"action": ["imageCommand", "6pAdd", "[6,7]"],
"serialPort": "/dev/ttyUSB1"},
"sender": "mySender"}
context = zmq.Context()
publisher = context.socket(zmq.REQ)
publisher.connect("tcp://localhost:60000")
publisher.send_json(d)
You can tell whether a given 6P request passed or failed depending on the return code that are documented there:
https://github.com/openwsn-berkeley/openwsn-fw/blob/develop/openstack/02b-MAChigh/sixtop.h