Dynamic geo location of object in google maps widget

I chain two propertysources together--one to set an autoProp, and another to write that autoProp to location via REST API. The location property isn't prefaced by system, so it can't be set in just the one propertySource--i don't think. 

In the example below, the autoProp is called "auto.loc". 

import org.apache.http.HttpEntity
import org.apache.http.client.methods.CloseableHttpResponse
import org.apache.http.client.methods.HttpPatch
import org.apache.http.impl.client.CloseableHttpClient
import org.apache.http.impl.client.HttpClients
import org.apache.http.util.EntityUtils
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Hex;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import groovy.json.JsonSlurper
import groovy.json.JsonOutput
import org.xbill.DNS.*


accessId = hostProps.get('lm.api.id')
accessKey = hostProps.get('lm.api.key')
company = 'mycompany'

resourcePath = '/device/devices/' + hostProps.get('system.deviceId')
url = 'https://' + company + '.logicmonitor.com/santaba/rest' + resourcePath + "?patchFields=customProperties&opType=replace"

location = hostProps.get('auto.loc')
customProperties = [name: 'location', value: location]
data = [customProperties: [customProperties]]
jsonData =  JsonOutput.toJson(data)
StringEntity payloadEntity = new StringEntity(jsonData)
epoch = System.currentTimeMillis()
requestVars = "PATCH" + epoch + jsonData + resourcePath


// construct signature
hmac = Mac.getInstance("HmacSHA256");
secret = new SecretKeySpec(accessKey.getBytes(), "HmacSHA256")
hmac.init(secret)
hmac_signed = Hex.encodeHexString(hmac.doFinal(requestVars.getBytes()))
signature = hmac_signed.bytes.encodeBase64()


CloseableHttpClient httpclient = HttpClients.createDefault();
http_request = new HttpPatch(url);
http_request.addHeader("Authorization" , "LMv1 " + accessId + ":" + signature + ":" + epoch);
http_request.setHeader("Accept", "application/json");
http_request.setHeader("Content-type", "application/json");
http_request.setEntity(payloadEntity);
response = httpclient.execute(http_request);
responseBody = EntityUtils.toString(response.getEntity());
code = response.getStatusLine().getStatusCode();

return(0)