Model S REST API

[brianman]

Assuming that elevation measurement comes from GPS, don't expect it to be very precise (or accurate). What is the minimum interval by which the reading varies?

Related: Compass and Elevation

Would you expect to be any less accurate than the latitude/longitude? The original question was about fetching elevation from lat/long, IIRC.

 

[doug]

Would you expect to be any less accurate than the latitude/longitude? The original question was about fetching elevation from lat/long, IIRC.

Definitely less accurate. The topic is covered in the link I provided.

You were saying the streaming API provided elevation data. I'd guess that elevation data came from GPS, but GPS elevation calculations have a comparatively large margin of error. You'll get better information by using the lat/long to look up the elevation data from some reference source, as you had suggested.

 

[brianman]

Definitely less accurate. The topic is covered in the link I provided.

You were saying the streaming API provided elevation data. I'd guess that elevation data came from GPS, but GPS elevation calculations have a comparatively large margin of error. You'll get better information by using the lat/long to look up the elevation data from some reference source, as you had suggested.

Ah, ok. Good to know. Lame but good to know.

 

[hans]

Ah, ok. Good to know. Lame but good to know.

Given enough samples, the errors can be averaged out. Think about how many times a Model S drives between two of the popular superchargers on Hwy 5 or Hwy 101 in California. Even if the individual errors are large, they average out to something much more accurate.

 

[brianman]

Did I miss it or is there no REST command for setting (or raising/lowering) the charge rate at the current location? Technically you could "throttle down" but starting and stopping every few seconds but that seems like a bad idea.

What I'm looking for is a way to set the charge rate to, say, 6 amps like you can via the in-car UI.

 

[gg_got_a_tesla]

I don't think there is, Brian. Otherwise, the Tesla mobile app would have surfaced that already.

 

[mnx]

Anyone interested in making an app that measures the car's 0-60 and 1/4 mile? I guess 1/4 second intervals isn't precise enough...

How about a lap timer? I could live with 1/4 second intervals with that.

We need the SDK already.

 

[hans]

Anyone interested in making an app that measures the car's 0-60 and 1/4 mile? I guess 1/4 second intervals isn't precise enough...

I just recorded a video of the speedometer and then use video editing software to time from last frame showing a 0 to the last frame showing a 60.

 

[sirfergy]

Has the charging timer been documented? I don't see it on apiary.

 

[brianman]

No data format changes observed in my logs when upgrading from

car_version=1.33.59

to

car_version=1.33.61

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Has the charging timer been documented? I don't see it on apiary.

Is it accessible from any flavors of the phone app?

 

[sirfergy]

Is it accessible from any flavors of the phone app?

Not that I've seen on iOS or Android, but it appears to be on the Windows Phone one.

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Ooops, it just displays the timer. I had assumed you could set it.

 

[sirfergy]

I'm trying to access the streaming service via c#, and am having an authorization issue.
Here is a snippet of my code:

HttpWebRequest request = HttpWebRequest.CreateHttp("https://streaming.vn.teslamotors.com/stream/" + vehicle_id + "/?values=speed,odometer,soc,elevation,est_heading,est_lat,est_lng,power,shift_state,range,est_range");
request.Method = "GET";
request.Credentials = new NetworkCredential(this.email, token);

When I run this, I get an http error, but if I pass the same values to curl it works. What is the correct way to pass the authorization in c#?
Thanks!

 

[brianman]

I'm trying to access the streaming service via c#, and am having an authorization issue.
Here is a snippet of my code:

HttpWebRequest request = HttpWebRequest.CreateHttp("https://streaming.vn.teslamotors.com/stream/" + vehicle_id + "/?values=speed,odometer,soc,elevation,est_heading,est_lat,est_lng,power,shift_state,range,est_range");
request.Method = "GET";
request.Credentials = new NetworkCredential(this.email, token);

When I run this, I get an http error, but if I pass the same values to curl it works. What is the correct way to pass the authorization in c#?
Thanks!

I'll try to remember to check and reply when I get home. I'm pretty sure I'm not using ".Credentials" anywhere in my source.

 

[sirfergy]

Thanks. I've tried setting the Authorization header, but then I just get an out of memory exception trying to read the response.

 

[hans]

I'm trying to access the streaming service via c#, and am having an authorization issue.
Here is a snippet of my code:

HttpWebRequest request = HttpWebRequest.CreateHttp("https://streaming.vn.teslamotors.com/stream/" + vehicle_id + "/?values=speed,odometer,soc,elevation,est_heading,est_lat,est_lng,power,shift_state,range,est_range");
request.Method = "GET";
request.Credentials = new NetworkCredential(this.email, token);

When I run this, I get an http error, but if I pass the same values to curl it works. What is the correct way to pass the authorization in c#?
Thanks!

Are you sure you are using the same token in C# and your curl script? When the token expires you will get a HTTP 401: Unauthorized response.
Tokens expire every 15 minutes from the top of the hour (i.e. Noon, 12:15, 12:30, 12:45, etc.)

 

[sirfergy]

Definitely used the same token, even refreshed. I still get a 401 error, I guess I just need to know what is the way to set the email/token information in C#.

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I figured it out. I was calling ReadToEnd instead of ReadLine.

 

[brianman]

Definitely used the same token, even refreshed. I still get a 401 error, I guess I just need to know what is the way to set the email/token information in C#.

Here's what I use:

req.Headers["Authorization"] = "Basic " + Convert.ToBase64String(Encoding.Default.GetBytes(strBasicAuthInfo));

where strBasicAuthInfo is

strEmail + ":" + _token

 

[ahimberg]

Thanks. I've tried setting the Authorization header, but then I just get an out of memory exception trying to read the response.

What platform are you running this on? I had to workaround an issue on windowsphone and the streaming api when the car is not moving (no data + not providing a content-length) which results in an out of memory exception you can't catch. The non-phone http stacks don't have the bug.

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Does anyone have a snapshot of charge_state data while supercharging? I had a report from someone that they data looked wrong from my app while supercharging... There is a supercharger somewhat near me now, but 2 hours driving to get there and back to collect this is a little out of the way

 

[brianman]

Does anyone have a snapshot of charge_state data while supercharging? I had a report from someone that they data looked wrong from my app while supercharging... There is a supercharger somewhat near me now, but 2 hours driving to get there and back to collect this is a little out of the way

This is roughly 17 minutes after a peak of 288 mi/hr (90 kW) charge rate.

charging_state=Charging
charge_limit_soc=90
charge_limit_soc_std=90
charge_limit_soc_min=50
charge_limit_soc_max=100
charge_to_max_range=false
battery_heater_on=false
not_enough_power_to_heat=false
max_range_charge_counter=0
fast_charger_present=true
battery_range=138.69
est_battery_range=159.64
ideal_battery_range=159.62
battery_level=59
battery_current=137.0
charge_starting_range=null
charge_starting_soc=null
charger_voltage=377
charger_pilot_current=0
charger_actual_current=0
charger_power=-52
time_to_full_charge=0.52
charge_rate=257.6
charge_port_door_open=true
scheduled_charging_start_time=null
scheduled_charging_pending=false
user_charge_enable_request=null
charge_enable_request=true

In case it's useful, here are the min/max across my entire DAT set:

battery_current=-357.0
battery_current=178.9
charge_rate=291.2
charger_voltage=400

 

[ahimberg]

the negative value for charger_power (-52kW) maybe was what they saw, or 0/0A. I guess fast_charger_present means to look at different values