@droneblocks/node-red-dexi/src/ros2-service-call.js

You want to make sure you don't lose any of your flow development. Make sure to map the host "flows" directory to the container directory as shown below. This will store the flow on your host machine if/when the container is destroyed.

module.exports = function(RED) {
    var ROSLIB = require('roslib');

    let dexiServices = []
  
    function Ros2ServiceCallNode(config) {
      RED.nodes.createNode(this, config);
      var node = this;
  
      node.server = RED.nodes.getNode(config.server);
      
      if (!node.server || !node.server.ros){
        return;
      }
  
      // Calling a service
      // -----------------
  
      var msgtype = config.typepackage + "/" + config.typename
      var serviceClient = new ROSLIB.Service({
        ros : node.server.ros,
        name : config.servicename,
        serviceType : msgtype
      });

      // Get list of topics to send to the editor
      node.server.ros.getServices((servicesResponse) => {
        dexiServices = servicesResponse
      })
  
      // node.on('input', (msg) => {
      //   serviceClient.callService(msg.payload, function(result) {
      //     console.log('Result for service call on '
      //       + serviceClient.name
      //       + ': '
      //       + result.success
      //       + ', '
      //       + result.message);
      //     var o = JSON.parse(JSON.stringify(result))
      //     node.send({payload: o});
      //   });
      // });

      node.on('input', (msg) => {

        let serviceClient = new ROSLIB.Service({
          ros : node.server.ros,
          name : msg.payload.serviceName,
          serviceType : msg.payload.serviceType
        })

        serviceClient.callService(msg.payload.serviceRequest, (response) => {
          // In the future we'll do something with the service response
          var o = JSON.parse(JSON.stringify(response))
          node.send({payload: o});
        })
    })
  
      node.server.on('ros connected', () => {
        node.status({fill:"green",shape:"dot",text:"connected"});
      });
  
      node.server.on('ros error', () => {
        node.status({fill:"red",shape:"dot",text:"error"});
      });
  
    }
  
    // Expose "API" to the editor for displaying topics
    RED.httpAdmin.get('/dexi/services', (req, res) => {
      res.json(dexiServices)
    })

    RED.nodes.registerType("ros2-service-call", Ros2ServiceCallNode);
  };