From 121ea65f4e41daa69c1e5cac163784e88ca26c3f Mon Sep 17 00:00:00 2001
From: Scott Bender <scott@scottbender.net>
Date: Thu, 16 Jan 2020 13:50:04 -0500
Subject: [PATCH] feature: add support for Digital Yacht's NavLink2

---
 lib/ikonvert.js | 156 ++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 131 insertions(+), 25 deletions(-)

diff --git a/lib/ikonvert.js b/lib/ikonvert.js
index 40d03b4..99e58b2 100644
--- a/lib/ikonvert.js
+++ b/lib/ikonvert.js
@@ -39,6 +39,10 @@ function iKonvertStream (options) {
     objectMode: true
   })
 
+  this.isTcp = options.tcp === true
+
+  this.outEvent = this.isTcp? 'navlink2-out' : 'ikonvertOut'
+  
   this.plainText = false
   this.reconnect = options.reconnect || true
   this.options = options
@@ -74,7 +78,14 @@ function iKonvertStream (options) {
       that.sendPGN(msg)
     })
 
-    this.sendString('$PDGY,N2NET_OFFLINE')
+    if ( this.isTcp ) {
+      this.isSetup = false
+      this.state = 0
+      this.setupCommands = this.getSetupCommands()
+      this.expecting = false
+    } else {
+      this.sendString('$PDGY,N2NET_OFFLINE')
+    }
 
     debug('started')
   }
@@ -87,7 +98,10 @@ iKonvertStream.prototype.start = function () {
 
 iKonvertStream.prototype.sendString = function (msg) {
   debug('sending %s', msg)
-  this.options.app.emit('ikonvertOut', msg)
+  if ( this.isTcp ) {
+    msg = msg + "\n\r"
+  }
+  this.options.app.emit(this.outEvent, msg)
 }
 
 iKonvertStream.prototype.sendPGN = function (pgn) {
@@ -136,40 +150,132 @@ iKonvertStream.prototype.setup = function () {
   this.sendString(txPgns)
 }
 
+iKonvertStream.prototype.getSetupCommands = function () {
+  let txPgns = '$PDGY,TX_LIST'
+  this.transmitPGNs.forEach(pgn => {
+    txPgns = txPgns + `,${pgn}`
+  })
+
+  const setupCommands = [
+    '$PDGY,N2NET_OFFLINE:$PDGY,TEXT,Digital_Yacht_Navlink2',
+    '$PDGY,N2NET_MODE,15:$PDGY,ACK,N2NET_MODE',
+    `${txPgns}:$PDGY,ACK,TX_LIST`,
+    '$PDGY,N2NET_INIT,ALL:$PDGY,ACK,N2NET_INIT,ALL'
+  ]
+  return setupCommands
+}
+
 iKonvertStream.prototype._transform = function (chunk, encoding, done) {
   let line = chunk.toString().trim()
   line = line.substring(0, line.length) // take off the \r
 
-    if ( line.startsWith('$PDGY') ) {
-    if ( line === '$PDGY,000000,,,,,,' ) {
-      //the iKonvert is not initialized
-      if ( !this.didSetup ) {
-        this.setup()
-        this.setProviderStatus('Initializing...')
-        this.didSetup = true
-      }
-    } else if ( line === '$PDGY,ACK,TX_LIST' ) {
-      debug('sending net init')
-      this.sendString('$PDGY,N2NET_INIT,ALL')
-      this.setProviderStatus('Initialized...')
-    } else if ( line === '$PDGY,ACK,N2NET_INIT,ALL' && !this.cansend ) {
-      this.cansend = true;
-      this.options.app.emit('nmea2000OutAvailable')
-      //this.sendString('$PDGY,SHOW_LISTS')
-    } else if ( line.startsWith('$PDGY,TEXT') ) {
-      debug(line)
-    } else if ( line.startsWith('$PDGY,000000') ) {
-      let parts = line.split(',')
-      debug('ikonvert can address: %s', parts[6])
+  if ( this.isTcp ) {
+    if ( line.startsWith('$PDGY,TEXT') ) {
       debug(line)
     } else if ( line.startsWith('$PDGY,NAK') ) {
       let parts = line.split(',')
-      let msg = `iKonvert error ${parts[2]}: ${parts[3]}`
+      let msg = `NavLink2 error ${parts[2]}: ${parts[3]}`
       console.error(msg)
       this.setProviderError(msg)
     }
-  } else {
+
+    if ( !this.isSetup ) {
+      debug(line)
+      let command = this.setupCommands[this.state].split(':')
+      if ( !this.expecting ) {
+        this.sendString(command[0])
+        this.expecting = true
+        this.sentTime = Date.now()
+        debug(`Waiting for ${command[1]}`)
+      } else {
+        if ( line.startsWith(command[1]) ) {
+          this.state = this.state + 1
+
+          if ( this.state == this.setupCommands.length ) {
+            this.isSetup = true
+            debug('Setup completed')
+          } else {
+            command = this.setupCommands[this.state].split(':')
+            this.sendString(command[0])
+            this.expecting = true
+            this.sentTime = Date.now()
+            debug(`Waiting for ${command[1]}`)
+          }
+        } else if ( Date.now() - this.sentTime > 5000 ) {
+          debug(`Did not receive expected: ${command[1]}, retrying...`)
+          this.sendString(command[0])
+          this.sentTime = Date.now()
+        }
+      }
+    } else {
+      this.push(line)
+    }
+   
+
+    /*
+    if ( !this.didSetRaw ) {
+      this.setProviderStatus('Initializing...')
+      this.sendString('$PDGY,N2NET_OFFLINE')
+      this.sendString('$PDGY,N2NET_MODE,15')
+      this.setup()
+      this.didSetRaw = true
+    } else if ( !this.isSetup ) {
+      debug(line)
+      if ( line.startsWith('$PDGY,ACK,TX_LIST') ) {
+        this.sendString('$PDGY,N2NET_INIT,ALL')
+      } else if ( line.startsWith('$PDGY,ACK,N2NET_INIT,ALL') || line.startsWith('$PDGY,NAK,1,ALREADY_INITIALISED') ) {
+        this.cansend = true;
+        this.isSetup = true;
+        this.options.app.emit('nmea2000OutAvailable')
+        this.setProviderStatus('Connected')
+      } 
+    } else {
+      this.push(line)
+    }
+    */
+
+   
+    /*else if ( !this.isSetup ) {
+      this.setup()
+      this.isSetup = true
+    }
+    if ( line.startsWith('$PDGY') ) {
+
+    } else if ( this.isSetup ) {
     this.push(line)
+      }*/
+  } else {
+    if ( line.startsWith('$PDGY') ) {
+      if ( line === '$PDGY,000000,,,,,,' ) {
+        //the iKonvert is not initialized
+        if ( !this.didSetup ) {
+          this.setup()
+          this.setProviderStatus('Initializing...')
+          this.didSetup = true
+        }
+      } else if ( line === '$PDGY,ACK,TX_LIST' ) {
+        debug('sending net init')
+        this.sendString('$PDGY,N2NET_INIT,ALL')
+        this.setProviderStatus('Initialized...')
+      } else if ( line === '$PDGY,ACK,N2NET_INIT,ALL' && !this.cansend ) {
+        this.cansend = true;
+        this.options.app.emit('nmea2000OutAvailable')
+        //this.sendString('$PDGY,SHOW_LISTS')
+      } else if ( line.startsWith('$PDGY,TEXT') ) {
+        debug(line)
+      } else if ( line.startsWith('$PDGY,000000') ) {
+        let parts = line.split(',')
+        debug('ikonvert can address: %s', parts[6])
+        debug(line)
+      } else if ( line.startsWith('$PDGY,NAK') ) {
+        let parts = line.split(',')
+        let msg = `iKonvert error ${parts[2]}: ${parts[3]}`
+        console.error(msg)
+        this.setProviderError(msg)
+      }
+    } else {
+      this.push(line)
+    }
   }
 
   done()