OK, as requested. Here's the log from startup, followed by my conf file 
(scrubbed).

May 23 17:10:03 wx weewx[1562]: engine: Initializing weewx version 3.6.2
May 23 17:10:03 wx weewx[1562]: engine: Using Python 2.7.9 (default, Sep 17 
2016, 20:26:04) #012[GCC 4.9.2]
May 23 17:10:03 wx weewx[1562]: engine: Platform 
Linux-4.4.38-v7+-armv7l-with-debian-8.0
May 23 17:10:03 wx weewx[1562]: engine: pid file is /var/run/weewx.pid
May 23 17:10:03 wx weewx[1566]: engine: Using configuration file 
/etc/weewx/weewx.conf
May 23 17:10:03 wx weewx[1566]: engine: Initializing engine
May 23 17:10:03 wx weewx[1566]: engine: Loading station type Vantage 
(weewx.drivers.vantage)
May 23 17:10:03 wx weewx[1551]: Starting weewx weather system: weewx.
May 23 17:10:03 wx weewx[1566]: vantage: driver version is 3.0.9
May 23 17:10:04 wx weewx[1566]: vantage: Opened up serial port 
/dev/ttyUSB0; baud 19200; timeout 4.00
May 23 17:10:04 wx weewx[1566]: vantage: gentle wake up of console 
successful
May 23 17:10:04 wx weewx[1566]: vantage: _setup; hardware type is 16
May 23 17:10:04 wx weewx[1566]: engine: Loading service 
weewx.engine.StdTimeSynch
May 23 17:10:04 wx weewx[1566]: engine: Finished loading service 
weewx.engine.StdTimeSynch
May 23 17:10:04 wx weewx[1566]: engine: Loading service 
weewx.engine.StdConvert
May 23 17:10:04 wx weewx[1566]: engine: StdConvert target unit is 0x1
May 23 17:10:04 wx weewx[1566]: engine: Finished loading service 
weewx.engine.StdConvert
May 23 17:10:04 wx weewx[1566]: engine: Loading service 
weewx.engine.StdCalibrate
May 23 17:10:04 wx weewx[1566]: engine: Finished loading service 
weewx.engine.StdCalibrate
May 23 17:10:04 wx weewx[1566]: engine: Loading service weewx.engine.StdQC
May 23 17:10:04 wx weewx[1566]: engine: Finished loading service 
weewx.engine.StdQC
May 23 17:10:04 wx weewx[1566]: engine: Loading service 
weewx.wxservices.StdWXCalculate
May 23 17:10:04 wx weewx[1566]: wxcalculate: The following values will be 
calculated: barometer=prefer_hardware, windchill=prefer_hardware, 
dewpoint=prefer_hardware, appTemp=prefer_hardware, 
rainRate=prefer_hardware, windrun=prefer_hardware, 
heatindex=prefer_hardware, maxSolarRad=prefer_hardware, 
humidex=prefer_hardware, pressure=prefer_hardware, 
inDewpoint=prefer_hardware, ET=prefer_hardware, altimeter=prefer_hardware, 
cloudbase=prefer_hardware
May 23 17:10:04 wx weewx[1566]: wxcalculate: The following algorithms will 
be used for calculations: altimeter=aaNOAA, maxSolarRad=RS
May 23 17:10:04 wx weewx[1566]: engine: Finished loading service 
weewx.wxservices.StdWXCalculate
May 23 17:10:04 wx weewx[1566]: engine: Loading service 
weewx.engine.StdArchive
May 23 17:10:04 wx weewx[1566]: engine: Archive will use data binding 
wx_binding
May 23 17:10:04 wx weewx[1566]: engine: Record generation will be attempted 
in 'hardware'
May 23 17:10:04 wx weewx[1566]: engine: Using archive interval of 300 
seconds (specified by hardware)
May 23 17:10:04 wx weewx[1566]: engine: Use LOOP data in hi/low 
calculations: 1
May 23 17:10:04 wx weewx[1566]: engine: Using binding 'wx_binding' to 
database 'weewx.sdb'
May 23 17:10:04 wx weewx[1566]: manager: Starting backfill of daily 
summaries
May 23 17:10:04 wx weewx[1566]: manager: Daily summaries up to date
May 23 17:10:04 wx weewx[1566]: engine: Finished loading service 
weewx.engine.StdArchive
May 23 17:10:04 wx weewx[1566]: engine: Loading service 
weewx.restx.StdStationRegistry
May 23 17:10:04 wx weewx[1566]: restx: StationRegistry: Station will not be 
registered: no station_url specified.
May 23 17:10:04 wx weewx[1566]: engine: Finished loading service 
weewx.restx.StdStationRegistry
May 23 17:10:04 wx weewx[1566]: engine: Loading service 
weewx.restx.StdWunderground
May 23 17:10:04 wx weewx[1566]: restx: Wunderground-RF: Data for station 
KNJWESTC2 will be posted
May 23 17:10:04 wx weewx[1566]: engine: Finished loading service 
weewx.restx.StdWunderground
May 23 17:10:04 wx weewx[1566]: engine: Loading service 
weewx.restx.StdPWSweather
May 23 17:10:04 wx weewx[1566]: restx: PWSWeather: Data for station w2irt 
will be posted
May 23 17:10:04 wx weewx[1566]: engine: Finished loading service 
weewx.restx.StdPWSweather
May 23 17:10:04 wx weewx[1566]: engine: Loading service weewx.restx.StdCWOP
May 23 17:10:04 wx weewx[1566]: restx: CWOP: Data for station W2IRT will be 
posted
May 23 17:10:04 wx weewx[1566]: engine: Finished loading service 
weewx.restx.StdCWOP
May 23 17:10:04 wx weewx[1566]: engine: Loading service weewx.restx.StdWOW
May 23 17:10:04 wx weewx[1566]: restx: WOW: Posting not enabled.
May 23 17:10:04 wx weewx[1566]: engine: Finished loading service 
weewx.restx.StdWOW
May 23 17:10:04 wx weewx[1566]: engine: Loading service 
weewx.restx.StdAWEKAS
May 23 17:10:04 wx weewx[1566]: restx: AWEKAS: Posting not enabled.
May 23 17:10:04 wx weewx[1566]: engine: Finished loading service 
weewx.restx.StdAWEKAS
May 23 17:10:04 wx weewx[1566]: engine: Loading service user.twitter.Twitter
May 23 17:10:05 wx weewx[1566]: restx: Shut down CWOP thread.
May 23 17:10:05 wx weewx[1566]: restx: Shut down PWSWeather thread.
May 23 17:10:05 wx weewx[1566]: restx: Shut down Wunderground-RF thread.
May 23 17:10:05 wx weewx[1566]: engine: Caught unrecoverable exception in 
engine:
May 23 17:10:05 wx weewx[1566]:     ****  No module named requests_oauthlib
May 23 17:10:05 wx weewx[1566]:     ****  Traceback (most recent call last):
May 23 17:10:05 wx weewx[1566]:     ****    File 
"/usr/share/weewx/weewx/engine.py", line 841, in main
May 23 17:10:05 wx weewx[1566]:     ****      engine = 
engine_class(config_dict)
May 23 17:10:05 wx weewx[1566]:     ****    File 
"/usr/share/weewx/weewx/engine.py", line 76, in __init__
May 23 17:10:05 wx weewx[1566]:     ****      self.loadServices(config_dict)
May 23 17:10:05 wx weewx[1566]:     ****    File 
"/usr/share/weewx/weewx/engine.py", line 140, in loadServices
May 23 17:10:05 wx weewx[1566]:     ****     
 self.service_obj.append(weeutil.weeutil._get_object(svc)(self, 
config_dict))
May 23 17:10:05 wx weewx[1566]:     ****    File 
"/usr/share/weewx/weeutil/weeutil.py", line 1015, in _get_object
May 23 17:10:05 wx weewx[1566]:     ****      mod = __import__(module)
May 23 17:10:05 wx weewx[1566]:     ****    File 
"/usr/share/weewx/user/twitter.py", line 85, in <module>
May 23 17:10:05 wx weewx[1566]:     ****      from twython import Twython, 
TwythonError, TwythonAuthError, TwythonRateLimitError
May 23 17:10:05 wx weewx[1566]:     ****    File 
"/usr/lib/python2.7/dist-packages/twython/__init__.py", line 23, in <module>
May 23 17:10:05 wx weewx[1566]:     ****      from .api import Twython
May 23 17:10:05 wx weewx[1566]:     ****    File 
"/usr/lib/python2.7/dist-packages/twython/api.py", line 14, in <module>
May 23 17:10:05 wx weewx[1566]:     ****      from requests_oauthlib import 
OAuth1, OAuth2
May 23 17:10:05 wx weewx[1566]:     ****  ImportError: No module named 
requests_oauthlib
May 23 17:10:05 wx weewx[1566]:     ****  Exiting.

CONF FILE:
# WEEWX CONFIGURATION FILE
#
# Copyright (c) 2009-2015 Tom Keffer <[email protected]>
# See the file LICENSE.txt for your rights.

##############################################################################

# This section is for general configuration information.

# Set to 1 for extra debug info, otherwise comment it out or set to zero
debug = 1

# Root directory of the weewx data file hierarchy for this station
WEEWX_ROOT = /

# How long to wait before timing out a socket (FTP, HTTP) connection
socket_timeout = 20

# Do not modify this. It is used when installing and updating weewx.
version = 3.6.2

##############################################################################

#   This section is for information about the station.

[Station]
    
    # Description of the station location
    location = "West Caldwell, NJ"
    
    # Latitude and longitude in decimal degrees
    latitude = 40.8615
    longitude = -74.2775
    
    # Altitude of the station, with unit it is in. This is downloaded from
    # from the station if the hardware supports it.
    altitude = 261, foot
    
    # Set to type of station hardware. There must be a corresponding stanza
    # in this file with a 'driver' parameter indicating the driver to be 
used.
    station_type = Vantage
    
    # If you have a website, you may specify an URL
    #station_url = http://www.example.com
    
    # The start of the rain year (1=January; 10=October, etc.). This is
    # downloaded from the station if the hardware supports it.
    rain_year_start = 1
    
    # Start of week (0=Monday, 6=Sunday)
    week_start = 6

##############################################################################

[Vantage]
    type = serial
    port = /dev/ttyUSB0
    driver = weewx.drivers.vantage
    
    
    # The time (in seconds) between LOOP packets.
    loop_interval = 2.5


##############################################################################

#   This section is for uploading data to Internet sites

[StdRESTful]
    
    [[StationRegistry]]
        # To register this weather station with weewx, set this to true
        register_this_station = true
    
    [[AWEKAS]]
        # This section is for configuring posts to AWEKAS.
        
        # If you wish to do this, set the option 'enable' to true,
        # and specify a username and password.
        enable = false
        username = replace_me
        password = replace_me
    
    
    [[CWOP]]
        # This section is for configuring posts to CWOP.
        
        # If you wish to do this, set the option 'enable' to true,
        # and specify the station ID (e.g., CW1234).
        enable = true
        station = W2IRT
        post_interval = 300
        log_success = True
        log_failure = True
        server_list = rotate.aprs.net:14580, rotate.aprs2.net:14580, 
cwop.aprs.net:14580, swop.aprs.net:23
        
        # If this is an APRS (radio amateur) station, uncomment
        # the following and replace with a passcode (e.g., 12345).
        passcode 
    
    
    [[PWSweather]]
        # This section is for configuring posts to PWSweather.com.
        
        # If you wish to do this, set the option 'enable' to true,
        # and specify a station and password.
        enable = true
        station = w2irt
        password
    
    [[WOW]]
        # This section is for configuring posts to WOW.
        
        # If you wish to do this, set the option 'enable' to true,
        # and specify a station and password.
        enable = false
        station = replace_me
        password = replace_me
    
    [[Wunderground]]
        # This section is for configuring posts to the Weather Underground.
        
        # If you wish to do this, set the option 'enable' to true,
        # and specify a station (e.g., 'KORHOODR3') and password.
        enable = true
        station = 
        password 
        
        # Set the following to True to have weewx use the WU "Rapidfire"
        # protocol. Not all hardware can support it. See the User's Guide.
        rapidfire = True
    [[Twitter]]
        oauth_token_secret = OAUTH_TOKEN_SECRET
        oauth_token = OAUTH_TOKEN
        app_key_secret = APP_KEY_SECRET
        app_key = APP_KEY

##############################################################################

#   This section specifies what reports, using which skins, to generate.

[StdReport]
    
    # Where the skins reside, relative to WEEWX_ROOT
    SKIN_ROOT = /etc/weewx/skins
    
    # Where the generated reports should go, relative to WEEWX_ROOT
    HTML_ROOT = /var/www/html/weewx
    
    # The database binding indicates which data should be used in reports.
    data_binding = wx_binding
    
    # Each of the following subsections defines a report that will be run.
    
    [[StandardReport]]
        # See the customizing guide to change the units, plot types and line
        # colors, modify the fonts, display additional sensor data, and 
other
        # customizations. Many of those changes can be made here by 
overriding
        # parameters, or by modifying templates within the skin itself.
        
        # The StandardReport uses the 'Standard' skin, which contains the
        # images, templates and plots for the report.
        skin = Standard
        [[[Units]]]
            [[[[Groups]]]]
                group_altitude = foot
                group_speed2 = mile_per_hour2
                group_pressure = inHg
                group_rain = inch
                group_rainrate = inch_per_hour
                group_temperature = degree_F
                group_degree_day = degree_F_day
                group_speed = mile_per_hour
    
    [[FTP]]
        # FTP'ing the results to a webserver is treated as just another 
report,
        # albeit one with an unusual report generator!
        skin = Ftp
        
        # If you wish to use FTP, uncomment and fill out the next four 
lines.
        #user = replace with the ftp username
        #password = replace with the ftp password
        #server = replace with the ftp server name, e.g, www.threefools.org
        #path = replace with the ftp destination directory (e.g., /weather)
        
        # Set to True for an FTP over TLS (FTPS) connection. Not all servers
        # support this.
        secure_ftp = False
        
        # To upload files from something other than what HTML_ROOT is set
        # to above, specify a different HTML_ROOT here.
        #HTML_ROOT = /var/www/html/weewx
        
        # Most FTP servers use port 21
        port = 21
        
        # Set to 1 to use passive mode, zero for active mode
        passive = 1
    
    [[RSYNC]]
        # rsync'ing to a webserver is treated as just another report
        skin = Rsync
        
        # If you wish to use rsync, you must configure passwordless ssh 
using
        # public/private key authentication from the user account that weewx
        # runs as to the user account on the remote machine where the files
        # will be copied.
        #
        # The following three lines determine where files will be sent.
        #server = replace with the rsync server name, e.g, 
www.threefools.org
        #path = replace with the rsync destination directory (e.g., 
/weather)
        #user = replace with the rsync username
        
        # Rsync can be configured to remove files from the remote server if
        # they don't exist under HTML_ROOT locally. USE WITH CAUTION: if you
        # make a mistake in the remote path, you could could unintentionally
        # cause unrelated files to be deleted. Set to 1 to enable remote 
file
        # deletion, zero to allow files to accumulate remotely.
        delete = 0

##############################################################################

#   This service acts as a filter, converting the unit system coming from
#   the hardware to a unit system in the database.

[StdConvert]
    
    # The target_unit affects only the unit system in the database. Once
    # chosen it cannot be changed without converting the entire database.
    # Modification of target_unit after starting weewx will result in
    # corrupt data - the database will contain a mix of US and METRIC data.
    #
    # The value of target_unit does not affect the unit system for
    # reporting - reports can display US, Metric, or any combination of 
units.
    #
    # In most cases, target_unit should be left as the default: US
    #
    # In particular, those migrating from a standard wview installation
    # should use US since that is what the wview database contains.
    
    # DO NOT MODIFY THIS VALUE UNLESS YOU KNOW WHAT YOU ARE DOING!
    target_unit = US    # Options are 'US', 'METRICWX', or 'METRIC'

##############################################################################

#   This section can adjust data using calibration expressions.

[StdCalibrate]
    
    [[Corrections]]
        # For each type, an arbitrary calibration expression can be given. 
        # It should be in the units defined in the StdConvert section.
        # Example:
        foo = foo + 0.2

##############################################################################

#   This section is for quality control checks. If units are not specified,
#   values must be in the units defined in the StdConvert section.

[StdQC]
    
    [[MinMax]]
        barometer = 26, 32.5, inHg
        outTemp = -40, 120, degree_F
        inTemp = 10, 120, degree_F
        outHumidity = 0, 100
        inHumidity = 0, 100
        windSpeed = 0, 120, mile_per_hour
        pressure = 24, 34.5, inHg

##############################################################################

#   This section controls the origin of derived values.

[StdWXCalculate]
    
    [[Calculations]]
        # Derived quantities are calculated by this service. Possible 
values are:
        #  hardware        - use the value provided by hardware
        #  software        - use the value calculated by weewx
        #  prefer_hardware - use value provide by hardware if available,
        #                      otherwise use value calculated by weewx
        
        pressure = prefer_hardware
        barometer = prefer_hardware
        altimeter = prefer_hardware
        windchill = prefer_hardware
        heatindex = prefer_hardware
        dewpoint = prefer_hardware
        inDewpoint = prefer_hardware
        rainRate = prefer_hardware

##############################################################################

#   For hardware that supports it, this section controls how often the
#   onboard clock gets updated.

[StdTimeSynch]
    
    # How often to check the weather station clock for drift (in seconds)
    clock_check = 14400
    
    # How much it can drift before we will correct it (in seconds)
    max_drift = 5

##############################################################################

#   This section is for configuring the archive service.

[StdArchive]
    
    # If the station hardware supports data logging then the archive 
interval
    # will be downloaded from the station. Otherwise, specify it (in 
seconds).
    archive_interval = 300
    
    # If possible, new archive records are downloaded from the station
    # hardware. If the hardware does not support this, then new archive
    # records will be generated in software.
    # Set the following to "software" to force software record generation.
    record_generation = hardware
    
    # Whether to include LOOP data in hi/low statistics
    loop_hilo = True
    
    # The data binding used to save archive records
    data_binding = wx_binding

##############################################################################

#   This section binds a data store to a database.

[DataBindings]
    
    [[wx_binding]]
        # The database must match one of the sections in [Databases].
        # This is likely to be the only option you would want to change.
        database = archive_sqlite
        # The name of the table within the database
        table_name = archive
        # The manager handles aggregation of data for historical summaries
        manager = weewx.wxmanager.WXDaySummaryManager
        # The schema defines the structure of the database.
        # It is *only* used when the database is created.
        schema = schemas.wview.schema

##############################################################################

#   This section defines various databases.

[Databases]
    
    # A SQLite database is simply a single file
    [[archive_sqlite]]
        database_type = SQLite
        database_name = weewx.sdb
    
    # MySQL
    [[archive_mysql]]
        database_type = MySQL
        database_name = weewx

##############################################################################

#   This section defines defaults for the different types of databases.

[DatabaseTypes]
    
    # Defaults for SQLite databases
    [[SQLite]]
        driver = weedb.sqlite
        # Directory in which the database files are located
        SQLITE_ROOT = /var/lib/weewx
    
    # Defaults for MySQL databases
    [[MySQL]]
        driver = weedb.mysql
        # The host where the database is located
        host = localhost
        # The user name for logging in to the host
        user = weewx
        # The password for the user name
        password = weewx

##############################################################################

#   This section configures the internal weewx engine.

[Engine]
    
    [[Services]]
        # This section specifies the services that should be run. They are
        # grouped by type, and the order of services within each group
        # determines the order in which the services will be run.
        prep_services = weewx.engine.StdTimeSynch
        data_services = ,
        process_services = weewx.engine.StdConvert, 
weewx.engine.StdCalibrate, weewx.engine.StdQC, 
weewx.wxservices.StdWXCalculate
        archive_services = weewx.engine.StdArchive
        restful_services = weewx.restx.StdStationRegistry, 
weewx.restx.StdWunderground, weewx.restx.StdPWSweather, 
weewx.restx.StdCWOP, weewx.restx.StdWOW, weewx.restx.StdAWEKAS, 
user.twitter.Twitter
        report_services = weewx.engine.StdPrint, weewx.engine.StdReport





On Monday, May 22, 2017 at 2:47:54 PM UTC-4, Peter Dougherty wrote:
>
> Weewx has developed a problem as described below. 
>
> I'm running it on a Raspberry Pi. It ran fine for 98 days and then stopped 
> cold. I pulled and restored power and can remote into the box using a VNC 
> client. The box is on the network, I can ping everything from it and I have 
> restarted weewx a dozen times using /etc/init.d/weewx restart. It appears 
> to be fine, but nothing is going out to Weather Underground, CWOP or 
> anybody else. The last update on the localhost interface was at 1pm today, 
> but the last update to WU and CWOP was on May 17th. The weather station is 
> a Davis Vantage Pro 2 using the USB dongle. I'm pretty sure it's sending 
> data from the logger to weewx but have no way or no understanding on how to 
> test communication with the Davis. According to the logs, it's functioning. 
> I have a huge log and I'm not sure how to post it, or how much of it I 
> should include here.
>
> I am an new user and extremely unfamiliar with Linux. The box was set up 
> by a friend and I myself am below kindergarten-level understanding of how 
> to fix it. I can follow a script but I have no natural sense of how to 
> proceed without being told explicitly. Any assistance tremendously 
> appreciated.
>

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