Here's an exerpt from Jerome's last post on the github topic on gateway development:
"The standalone gateway seems complete enough for me to be published, although I'd rather have a little feedback before recommending it.
It works basically the same way. Here are the main features:
- Can be parameterized either via emoncms GUI (with current limitations of the interface) or through a configuration file. Useful for those who don't want to install a local emoncms just for the configuration of their gateway. This also allows to add features without the need for complex GUI edition.
- Can read inputs from the RFM2Pi, but also inputs from the serial port of the form "NodeID val1 val2 ...", or even from a socket. This socket possibility means any application on the same machine or on the network can send data to the gateway. This even solves the inter-applications issue. It is better than writing to a file, in my opinion.
- Extensibility. By design, it should be easy to create new inputs (data sources) or outputs (another server's API). It uses classes, so a new input (listener) or output (buffer) can be created through inheritance/overriding.
See readme file for more explanations.
I should add a socket use sample, but it's pretty basic and require very few code. Here's a python example:
Currently, each buffer instantiated in the gateway buffers a given amount of data when network is down. This is limited (we don't want to eat up all memory). Next step could be to add the possibility to buffer samples in a file (with care for SD card wearout)."
HOST = 'raspberrypi' # The remote host, can be 'localhost' just the same
PORT = 50011 # The port chosen in the gateway config
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.send('14 15 26\r\n')
To try it out see the github repository here: https://github.com/Jerome-github/oem_gateway. Jerome is looking for testers and would appreciate feedback on it. To engage in discussion regarding this post, please post on our Community Forum.