ERROR Connecting WS EMS on Raspberry Pi

[dw22]

Hi, I have problems when executing wsems, any help will be appreciated.

my config.json file is below

{
"ws_servers":   [{
            "host": "192.168.1.241",
            "port": 443
        }],
    "http_server":  {
        "host": "127.0.0.1",
        "port": 8080,
        "ssl": false,
       "authenticate": false
    },
    "appKey":   "96d6b33a-33c7-41c9-bda2-53416afa9876",
    "logger":   {
        "level":    "DEBUG"
    },
    "auto_bind":    [{
            "name": "PiThing",
            "gateway":  false
        }],
    "certificates": {
        "validate": false,
        "allow_self_signed":true
    },
    "ws_connection":    {
        "encryption":   "ssl",
        "verbose":  true,
        "msg_timeout":  1000
    }
}

this is the error i received

[FORCE] 2019-01-10 13:35:19,976 ./wsems: Initializing EMS ....
[FORCE] 2019-01-10 13:35:19,976 main: Using config file /home/pi/microserver/etc/config.json
[INFO ] 2019-01-10 13:35:19,976 ./wsems: Creating the WsEms proxy.
[INFO ] 2019-01-10 13:35:19,977 ./wsems: Starting HTTP Server.
[INFO ] 2019-01-10 13:35:19,977 Main: Using custom certificate and private key for HTTP Server
[WARN ] 2019-01-10 13:35:19,977 Main: Encryption is disabled on HTTP Server.
[WARN ] 2019-01-10 13:35:19,977 Main: Authentication is disabled on the HTTP Server.
[FORCE] 2019-01-10 13:35:19,977 httpServer: starting http server port=8080
[INFO ] 2019-01-10 13:35:19,977 ./wsems: Initializing the ThingWorx REST interface.
[INFO ] 2019-01-10 13:35:19,978 wsEmsProxy::initialize: FIPS is disabled.
[DEBUG] 2019-01-10 13:35:19,978 httpServer: http server bound to port=8080.
[INFO ] 2019-01-10 13:35:19,978 wsEmsProxy::initialize: Encryption is enabled on Web Socket connection.
[WARN ] 2019-01-10 13:35:19,979 SDK: SDK Version: 2.0.4
[WARN ] 2019-01-10 13:35:19,980 SDK: TLS Library: OpenSSL
[WARN ] 2019-01-10 13:35:19,980 SDK: TLS Library Version: 1.0.2l
[WARN ] 2019-01-10 13:35:19,980 SDK: FIPS Capable
[DEBUG] 2019-01-10 13:35:19,980 SDK: twWs_Create: Initializing Websocket Client for 192.168.1.241:443//Thingworx/WS
[DEBUG] 2019-01-10 13:35:19,980 SDK: twTlsClient_Create: Initializing TLS Client
[DEBUG] 2019-01-10 13:35:19,995 SDK: twApi_Initialize: Websocket Established after 0 tries
[DEBUG] 2019-01-10 13:35:19,995 SDK: subscribedPropsMgr_Initialize: Initializing subscribed properties manager
[INFO ] 2019-01-10 13:35:19,995 WsProxy::initialize: EMS Version 5.4.0.114
[INFO ] 2019-01-10 13:35:19,995 WsProxy::initialize: twApi singleton initialized
[WARN ] 2019-01-10 13:35:19,995 WsProxy::initialize: Certificate validation is disabled.
[WARN ] 2019-01-10 13:35:19,995 WsProxy::initialize: Self signed certificates are enabled.
[DEBUG] 2019-01-10 13:35:19,995 jsonConfigurator::getJsonEntity: Key validation_criteria not found
[DEBUG] 2019-01-10 13:35:19,996 jsonConfigurator::getJsonEntity: Parent file not found
[DEBUG] 2019-01-10 13:35:19,997 SDK: twTunnelManager_Create: Tunnel Manager singleton already exists
[ERROR] 2019-01-10 13:35:19,997 SDK: twMap_Add: parse function returned null.
[DEBUG] 2019-01-10 13:35:19,997 WsEmsProxy::bindThing: Host specified as 'localhost'. Testing IPV6/IPV4 connectivity
[WARN ] 2019-01-10 13:35:20,0 WsEmsProxy::bindThing: Exception connecting to localhost:8001. Err: Connection refused [localhost:8001]
[WARN ] 2019-01-10 13:35:20,1 WsEmsProxy::bindThing: Changing host from 'localhost' to '127.0.0.1'
[DEBUG] 2019-01-10 13:35:20,1 SDK: added PiThing to boundList
[DEBUG] 2019-01-10 13:35:20,1 SDK: twApi_BindThings: not currently connected, only binding things to api
[DEBUG] 2019-01-10 13:35:20,1 SDK: twMessage_Delete: Deleting BIND Message: 1
[DEBUG] 2019-01-10 13:35:20,1 jsonConfigurator::getJsonEntity: Parent file not found
[INFO ] 2019-01-10 13:35:20,1 wsEmsProxy::initialize: Initialization complete!
[INFO ] 2019-01-10 13:35:20,3 ./wsems: Starting the connection.

192.168.1.241:443-->[DEBUG] 2019-01-10 13:35:20,6 SDK: twTlsClient_Reconnect: Re-establishing SSL context
[DEBUG] 2019-01-10 13:35:20,6 SDK: twTlsClient_Connect: Connecting to server
[DEBUG] 2019-01-10 13:35:20,50 SDK: twTlsClient_Connect: TLS connection established
[ERROR] 2019-01-10 13:35:20,57 SDK: twWs_Connect: Error initializing web socket. Response code: 404
[DEBUG] 2019-01-10 13:35:25,57 SDK: twTlsClient_Reconnect: Re-establishing SSL context
[DEBUG] 2019-01-10 13:35:25,58 SDK: twTlsClient_Connect: Connecting to server
[DEBUG] 2019-01-10 13:35:25,143 SDK: twTlsClient_Connect: TLS connection established
[ERROR] 2019-01-10 13:35:25,157 SDK: twWs_Connect: Error initializing web socket. Response code: 404
[DEBUG] 2019-01-10 13:35:30,158 SDK: twTlsClient_Reconnect: Re-establishing SSL context
[DEBUG] 2019-01-10 13:35:30,158 SDK: twTlsClient_Connect: Connecting to server
[DEBUG] 2019-01-10 13:35:30,242 SDK: twTlsClient_Connect: TLS connection established
[ERROR] 2019-01-10 13:35:30,256 SDK: twWs_Connect: Error initializing web socket. Response code: 404

[jdass]

Couple of things to check -

1.) Check the validity of the Application Key - if expiration is a future date

2.) Check is the user associated with the Application key is the default 'Administrator' user

[dw22]

changed the user to Administrator , still did not work though.

[slangley]

Hi @dw22.

After making the change, are you still getting the same error?

Regards.

--Sharon

[Rick-Stanley]

The Raspberry Pi guide was updated with instructions for connecting to ThingWorx 8.4, the latest Raspberry Pi Operating System (Raspbian Stretch), and the latest EMS:

https://developer.thingworx.com/en/resources/guides/thingworx-raspberry-pi-quickstart

Please give this updated guide a try

[Manirajan]

Can you share the config.lua file too?

[Rick-Stanley · Accepted solution]

All the files are available here:

https://developer.thingworx.com/en/resources/guides/thingworx-raspberry-pi-quickstart

And are also duplicated below.

The config.lua file references the PiTemplate.lua file which contains hardware specific code that will only work on a Raspberry Pi. To get this to work on other hardware, you would need to modify the queryHardware() function to work with whatever device you are using

config.json

{ 
	"ws_servers":	[{
				"host":	"pp-19022819274p.portal.ptc.io",
				"port":	443
		}],
	"appKey":	"8918cf96-xxxx-xxxx-801f-ac6cdb450279",
	"http_server" : {
		"host": "127.0.0.1",
		"port": 8080,
		"use_default_certificate" : true,
		"ssl" : false,
		"authenticate" : false
		},
	"logger":{
		"level":"INFO"
	},


	"certificates":{
		"validate": false
	}
}

config.lua

scripts.log_level = "INFO"
scripts.script_resource_ssl = false
scripts.script_resource_authenticate = false
scripts.PiThing = {
  file = "thing.lua",
  template = "PiTemplate",
  scanRate = 1000,
  taskRate = 30000
}
scripts.rap_host = "127.0.0.1"
scripts.rap_port = 8080

PiTemplate.lua

module ("templates.PiTemplate", thingworx.template.extend)
properties.cpu_temperature={baseType="NUMBER", pushType="ALWAYS", value=0}
properties.cpu_freq={baseType="NUMBER", pushType="ALWAYS", value=0}
properties.cpu_volt={baseType="NUMBER", pushType="ALWAYS", value=0}

serviceDefinitions.GetSystemProperties(
  output { baseType="BOOLEAN", description="" },
  description { "updates properties" }
)

services.GetSystemProperties = function(me, headers, query, data)
  log.trace("[PiTemplate]","########### in GetSystemProperties#############")
  queryHardware()
  -- if properties are successfully updated, return HTTP 200 code with a true service return value
  return 200, true
end

function queryHardware()
-- use the vcgencmd shell command to get raspberry pi system values and assign to variables
-- measure_temp returns value in Celsius
-- measure_clock arm returns value in Hertz
-- measure_volts returns balue in Volts
local tempCmd = io.popen("vcgencmd measure_temp")
local freqCmd = io.popen("vcgencmd measure_clock arm")
local voltCmd = io.popen("vcgencmd measure_volts core")

-- set property temperature
  local s = tempCmd:read("*a")
  s = string.match(s,"temp=(%d+\.%d+)");
  log.debug("[PiTemplate]",string.format("temp %.1f",s))
  properties.cpu_temperature.value = s

-- set property frequency
  s = freqCmd:read("*a")
  log.debug("[PiTemplate]",string.format("raw freq %s",s))
  s = string.match(s,"frequency%(45%)=(%d+)");
  s = s/1000000
  log.debug("[PiTemplate]",string.format("scaled freq %d",s))
  properties.cpu_freq.value = s

-- set property volts
  s = voltCmd:read("*a")
  log.debug("[PiTemplate]",string.format("raw volts %s", s))
  s = string.match(s,"volt=(%d+\.%d+)");
  log.debug("[PiTemplate]",string.format("scaled volts %.1f", s))
  properties.cpu_volt.value = s
end

tasks.refreshProperties = function(me)
  log.trace("[PiTemplate]","~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In tasks.refreshProperties~~~~~~~~~~~~~ ")
  queryHardware()
end

[slangley]

Hi @dw22.

If one of the previous responses answered your question, please mark the appropriate one as the Accepted Solution for the benefit of others with the same question.

Regards.

--Sharon