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technical:mqtt [2022/06/19 21:23]
admin [Command -> API Gateway] 		technical:mqtt [2022/06/19 21:48] (current)
admin
Line 83: Line 83:
 </code> </code>
 ==== Command -> mqtt.lua ==== ==== Command -> mqtt.lua ====
 +  * Here is a snippet in **/etc/MESHdesk/mqtt.lua** which shows what it will do when a message is published from the API Gateway.
 +  * This is the command which it will then respond to.
 +<code lua>
 +client.ON_MESSAGE = function(mid, topic, payload)
 +    -- Parse/Decode JSON Payload
 +    local jsonStr           = luci_json.parse(payload)
 +    -- Check if message belongs to us (MAC Address)
 +</code>
 ==== Response -> mqtt.lua ==== ==== Response -> mqtt.lua ====
 +  * Depending on the type of command the code in Lua will determine the correct response.
 +  * Here is a snippet in **/etc/MESHdesk/mqtt.lua** which respond to the **execute** action.
 +  * This is part of the code which are processing the command that the mesh node or access point received (inside the **ON_MESSAGE** event)
 +<code lua>
 +--Here depending on the value of jsonStr['action'] we will either just execute the command or execute and report the output
 +if(jsonStr['action'] == 'execute')then
 +    print("MODE IS "..mode);
 +    if(mode == 'mesh')then
 +        message = luci_json.stringify({mode=mode,node_id=nodeId,mesh_id=meshId,mac=macAddr,cmd_id=cmdId,status='os_command'});
 +    end
 +    if(mode == 'ap')then
 +        message = luci_json.stringify({mode=mode,ap_id=apId,mac=macAddr,cmd_id=cmdId,status='os_command'});
 +    end
 +    
 +    local cl_execute = mqtt.new();
 +    cl_execute:login_set(MQTT_USER, MQTT_PASS)
 +    cl_execute:connect(MQTT_HOST)
 +    --Connected now publish
 +    cl_execute.ON_CONNECT = function()
 +        cl_execute:publish(cmdTopic, message, qos, retain);
 +    end
 +    --Done publishing - now execute command 
 +    cl_execute.ON_PUBLISH = function()
 +        cl_execute:disconnect();
 +        os.execute(jsonStr['cmd']);
 +    end
 +    cl_execute:loop_forever();                
 +end
 +
 +</code>
 ==== Response -> API Gateway ==== ==== Response -> API Gateway ====
 +  * The API Gateway subscribe to the topic which the mesh node or access point publishes to.
 +  * Here is a snippet from the **/opt/Rdcore-API-Gateway/routes/rdmesh.js** file that execute some code when a message is received on that topic
 +<code javascript>
 +default:
 +    request.put({
 +            url: mesh_controller + '/cake3/rd_cake/node-actions/node-command.json',
 +            form: data
 +        },
 +        function (err, res, body) {
 +            if (err) {
 +                console.error('Error Occurred: ' + err);
 +            }
 +
 +            console.log(body);
 +        }
 +    );
 +    break;
 +</code>
 ==== Response -> CakePHP Controller ==== ==== Response -> CakePHP Controller ====
 +  * Finally we can look at the CakePHP code that process the response so our system know and can indicate the mesh node or access point did receive the instruction.
 +  * Lets look at the **/var/www/html/cake3/rd_cake/src/Controller/NodeActionsController.php** file.
 +<code php>
 +//--This comes from the NodeJS API Gateway Application in response to 'execute' type node_actions
 +//--This comes from the NodeJS API Gateway Application in FIRST response to 'execute_and_reply' type node_actions
 +public function nodeCommand(){
 +
 +    if($this->request->is('put')){
 +        $data = $this->request->data;
 +        if((!empty($data['node_id']))||(!empty($data['ap_id']))){
 +            // update command status to fetched
 +            $model = 'NodeActions';
 +            if($data['mode'] == 'ap'){
 +                $model = 'ApActions';
 +            }
 +            
 +            $entity  = $this->{$model}->find()->where(['id' => $data['cmd_id']])->first();
 +            if($entity){
 +                $entity->status = 'fetched';
 +                $this->{$model}->save($entity);
 +            }
 +
 +            $this->set(array(
 +                'data'          => $data,
 +                'success'       => true,
 +                '_serialize'    => array('data','success')
 +            ));
 +        } else {
 +            $this->set(array(
 +                'message'     => 'Node ID not found',
 +                'success'       => false,
 +                '_serialize'    => array('message','success')
 +            ));
 +        }
 +
 +    } else {
 +        $this->set(array(
 +            'message'         => 'Send only PUT request',
 +            'success'       => false,
 +            '_serialize'    => array('message','success')
 +        ));
 +    }
 +}
 +</code>
 +
  
  
Last modified: 2022/06/19 21:23