jbd-plugin/plugin/index.js

jbd battery plugin for SignalK

const fs = require('fs');
const path = require('path');
const lastUpdateTimes = {};
const id = 'jbd-plugin';

module.exports = function(app) {
  var plugin = {};
  var pythonProcess;
    
  plugin.id = id;
  plugin.name = 'JBD/Fogstar Battery Plugin';
  plugin.description = 'Connects to multiple JBD style batteries over BLE';
    
plugin.start = function(options, restartPlugin) {
  app.debug("Plugin starting JBD")
  app.debug(options)

  // Store python processes in an array to manage them later
  const pythonProcesses = [];

  options.batteries.forEach(battery => {
    lastUpdateTimes[battery.id] = Date.now();
      const fifoPath = path.join('/var/run', `nav${battery.id}`);

      const fifoStream = fs.createReadStream(fifoPath, { encoding: 'utf8' });

      fifoStream.on('data', (data) => {
        app.debug(`Received data from Python script for battery ${battery.id}: ${data.toString().trim()}`);
        try {
        const msg = JSON.parse(data.toString());
            if (msg.type == "data"){
                const jsonData = msg.data;
                app.handleMessage(plugin.id, {
                  updates: [
                    {
                      values: [
                        {
                          path: `electrical.batteries.${battery.bus}.voltage.${battery.id}`,
                          value: jsonData["Total Voltage"]
                        },
                        {
                          path: `electrical.batteries.${battery.bus}.name.${battery.id}`,
                          value: battery.name
                        },
                        {
                          path: `electrical.batteries.${battery.bus}.capacity.nominal.${battery.id}`,
                          value: jsonData["Nominal Capacity J"]
                        },
                        {
                          path: `electrical.batteries.${battery.bus}.capacity.remaining.${battery.id}`,
                          value: jsonData["Residual Capacity J"]
                        },
                        {
                          path: `electrical.batteries.${battery.bus}.current.${battery.id}`, // Ensure this path is correct
                          value: jsonData["Current"]
                        },
                        {
                          path: `electrical.batteries.${battery.bus}.capacity.stateOfCharge.${battery.id}`, // Ensure this path is correct
                          value: jsonData["RSOC"]
                        },
                        {
                          path: `electrical.batteries.${battery.bus}.cycles.${battery.id}`, // Ensure this path is correct
                          value: jsonData["Cycle Life"]
                        },
                        {
                          path: `electrical.batteries.${battery.bus}.temperature.${battery.id}`, // Ensure this path is correct
                          value: jsonData["Temperature"]
                        },
                        {
                          path: `electrical.batteries.${battery.bus}.protection.${battery.id}`, // Ensure this path is correct
                          value: jsonData["Protection Status"]
                        },
                        {
                          path: `electrical.batteries.${battery.bus}.chemistry.${battery.id}`, // Ensure this path is correct
                          value: 'LiFePO4'
                        }

                      ]
                    }
                  ]
                });
                lastUpdateTimes[battery.id] = Date.now();
            }
            if (msg.type == "status"){
                app.handleMessage(plugin.id, {
                  updates: [
                    {
                      values: [
                        {
                          path: `electrical.batteries.${battery.bus}.connection.${battery.id}`,
                          value: msg["string"]
                        }
                      ]
                    }
                  ]
                });
            }
      } catch (error) {
        app.debug(`Error parsing JSON data for battery ${battery.id}: ${error}`);
        app.debug(`Received data from Python script for battery ${battery.id}: ${data.toString().trim()}`);
      }
    });

      
    // Function to check for stale data
    function checkForStaleData() {
      const TIMEOUT = 60000; // 1 minute timeout
      const currentTime = Date.now();

      options.batteries.forEach(battery => {
        if (currentTime - lastUpdateTimes[battery.id] > TIMEOUT) {
          // Data is stale, send update to set values to null or ignore
          app.debug(`Stale data for battery ID ${battery.id}`)
          app.handleMessage(plugin.id, {
            updates: [
              {
                values: [
                  { path: `electrical.batteries.${battery.bus}.voltage.${battery.id}`, value: null },
                  { path: `electrical.batteries.${battery.bus}.capacity.${battery.id}`, value: null },
                  // ... set other paths to null or ignore as needed
                ]
              }
            ]
          });
        }
      });
    }

    // Set an interval to periodically check for stale data
    setInterval(checkForStaleData, 5000); // Check every 5 seconds, for example
  });

  plugin.stop = function() {
    pythonProcesses.forEach(process => {
      if (process) {
        process.kill();
      }
    });
  };
};


plugin.schema = {
  type: 'object',
  properties: {
    batteries: {
      type: 'array',
      title: 'Batteries',
      items: {
        type: 'object',
        required: ['name', 'bus', 'id'],
        properties: {
          name: {
            type: 'string',
            title: 'Name'
          },
          bus: {
            type: 'string',
            title: 'Bus'
          },
          id: {
            type: 'number',
            title: 'Battery ID'
          }
        }
      }
    },
    refresh: {
      type: 'number',
      title: 'Refresh Rate',
      description: 'How many seconds between updates',
      default: 1
    }
  }
};



    
  return plugin;
};