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+# Copyright 2017-present Open Networking Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# onos common functions
+
+*** Settings ***
+Documentation     Library for various utilities
+Library           SSHLibrary
+Library           HttpLibrary.HTTP
+Library           String
+Library           DateTime
+Library           Process
+Library           Collections
+Library           RequestsLibrary
+Library           OperatingSystem
+
+*** Keywords ***
+Execute ONOS Command
+    [Arguments]    ${host}    ${port}    ${cmd}
+    [Documentation]    Establishes an ssh connection to the onos contoller and executes a command
+    ${conn_id}=    SSHLibrary.Open Connection    ${host}    port=${port}    prompt=onos>    timeout=300s
+    SSHLibrary.Login    karaf    karaf
+    ${output}=    SSHLibrary.Execute Command    ${cmd}
+    SSHLibrary.Close Connection
+    [Return]    ${output}
+
+Validate OLT Device in ONOS
+    [Documentation]    Checks if olt has been connected to ONOS
+    [Arguments]    ${serial_number}
+    ${resp}=    Get Request    ONOS    onos/v1/devices
+    ${jsondata}=    To Json    ${resp.content}
+    Should Not Be Empty    ${jsondata['devices']}
+    ${length}=    Get Length    ${jsondata['devices']}
+    @{serial_numbers}=    Create List
+    : FOR    ${INDEX}    IN RANGE    0    ${length}
+    \    ${value}=    Get From List    ${jsondata['devices']}    ${INDEX}
+    \    ${sn}=    Get From Dictionary    ${value}    serial
+    \    ${of_id}=    Get From Dictionary    ${value}    id
+    Should Be Equal As Strings    ${sn}    ${serial_number}
+    Set Suite Variable    ${of_id}
+
+Verify Eapol Flows Added
+    [Arguments]    ${expected_onus}
+    [Documentation]    Matches for number of eapol flows based on number of onus
+    ${eapol_flows_added}=    Execute ONOS Command    flows -s -f ADDED | grep eapol | wc -l
+    Should Contain    ${eapol_flows_added}    ${expected_onus}
+
+Verify Number of AAA-Users
+    [Arguments]    ${expected_onus}
+    [Documentation]    Matches for number of aaa-users authorized based on number of onus
+    ${aaa_users}=    Execute ONOS Command    aaa-users | grep AUTHORIZED | wc -l
+    Should Contain    ${aaa_users}    ${expected_onus}
+
+Validate DHCP Allocations
+    [Arguments]    ${expected_onus}
+    [Documentation]    Matches for number of dhcpacks based on number of onus
+    ${allocations}=    Execute ONOS Command    dhcpl2relay-allocations | grep DHCPACK | wc -l
+    Should Contain    ${allocations}    ${expected_onus}
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