Within the last days I did a some testing, and I read the threads regarding
the Davis WeatherLink Live device for Davis Vantage Pro 2, and I wonder,
which driver is best to use.
Let me summarize, what I found out about the drivers.
Just to avoid confusion:
- "WeatherLink IP": a discontinued adaptor to insert into the Davis
console
- "WeatherLink Live": a separate device to receive data from a wireless
Davis Vantage Pro 2 station
Both of them use a different protocol to communicate with the PC.
As I bought the station recently, I got the WeatherLink Live device. Then I
looked for the appropriate driver, and I found a lot of them:
*Vantage (weewx.drivers.vantage)*
Although it is not mentioned in the documentation, I assume, that that
driver is for the old, discontinued adaptors, only. I had a look at the
code of the driver, and it seems so.
Could someone confirm or deny?
*WLL (users.wll)*
I tried that driver, and it works. There were 2 little problems.
First, I use a separate anemometer transmitter kit. Unfortunately, the
driver reads the values from the transmitter kit and shows the wind, only.
I changed the code a little bit, and now it reads the values from the
station including the wind. I reported the changes to the author of the
driver.
Second, if you stop Weewx, the driver reports an exception to the logs, but
does not finish. I have to kill the process by "kill -KILL".
Nevertheless, this is the driver I still use.
*WeatherLink Live* (recommended by Weewx)
That driver seems attractive, because it announces to use both the
broadcast messages and the HTTP requests.
Remark for setup: Not as he documentation says, I had to set up the wind
for ID 1 instead of 2 to get data.
Unfortunately, in my case, every now and then the log shows an error
message, and Weewx pauses for 60 seconds. The error message reads:
Oct 31 18:39:27 LokalWiki weewx[147658] ERROR
user.weatherlink_live.scheduler: Error caught in scheduler tick. Not
rescheduling
Oct 31 18:39:27 LokalWiki weewx[147658] INFO weewx.engine: Main loop
exiting. Shutting engine down.
Oct 31 18:39:27 LokalWiki weewx[147658] INFO weewx.engine: Shutting down
StdReport thread
Oct 31 18:39:27 LokalWiki weewx[147658] CRITICAL __main__: Caught
WeeWxIOError: Error while receiving or processing packets:
HTTPConnectionPool(host='192.168.XX.XX', port=80): Max retries exceeded
with url: /v1/real_time?duration=1500 (Caused by
NewConnectionError('<urllib3.connection.HTTPConnection object at
0x7f6b45b15340>: Failed to establish a new connection: [Errno 111]
Verbindungsaufbau abgelehnt'))
Oct 31 18:39:27 LokalWiki weewx[147658] CRITICAL __main__: **** Waiting 60
seconds then retrying...
As the driver uses 2 different data sources, the author may want to change
the error handling and simply queries the device by HTTP request if the
real time broadcast cannot be activated for some reason. I think that would
make the driver more robust.
(Remark: I don't think, the error message is really a problem of the driver
but rather one of the network.)
*WeatherLinkLiveJSON*
I did not test this one.
*Weatherlinkliveudp *(recommended by Weewx)
I did not test this one, because I thought, "WeatherLink Live" will be more
than that, as it uses both ways to communicate with the device.
I can be wrong but I think I read somewhere the broadcast messages and the
HTML request do not deliver the same set of information. Correct me, if I
am wrong.
And in one thread I read, someone decoded the V2 API of Davis, but that
thread gave no further information, an I see no driver that implements that.
What would you recommend a new user to use?
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