Setup SSH data retrieval

[matthew-ia]

This will be necessary for track races. We will have canpi connected to a wireless hotspot, and the ChaseUI laptop also connected to internet. ChaseUI will ssh into the pi, and sftp a data log file. The updates will be less frequent than the normal socket method, but it's the best method I can think of without the AP's being in range.

I found an ssh/sftp node module that we can use; it seems like it'll work pretty well and isn't too complex.

[stevesoaress]

If the two computers are on the same local network, a connection to the internet is not needed.

[matthew-ia]

@stevesoaress This is solely for FSGP, the track race, during which we are not likely to have connection between the track and car via the local network. We were thinking about getting routers to place around the track to extend the connection, but I decided (with Cristian & Andrew's input) to go this route instead because:

• The local network connection will either never be established at the distance between the track and our "Chase balcony", or for a short time period per lap (my guess is < 10 seconds at low quality connection) which could prove problematic with time taken to establish the connection, and we would definitely have to figure out how to keep the data from being corrupted if it was in the middle of sending when it lost connection.
• it wasn't cost effective to buy a bunch of routers/extenders (we were looking at Pineapple Wifi, $100 a pop) to extend the range of the local network, and buying normal routers would be a pain to set up/ manage; Pineapple has management software for creating a network from multiple Pineapple Wifi nodes; AND we couldn't find info on whether or not its allowed to place hardware along the track (with the time it took for the race organizers to get back to us about answers to very important questions regarding the design of our car so I didn't want to risk waiting on confirmation.
• we were already getting LTE Hotspots (we have them now), and the Verizon service map shows Hastings, where the track is, to have service so we should be able to have a reliable connection there since we won't be moving long distance
• we can retrieve updated data more frequently than once a lap via data dumps

We will still use the local network connection for ASC, the road race.

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Here's a map for reference of the distance between the balcony and the track (this shoes 129 ft. and the shortest distance I could measure is still about 112 ft).