Response value 6: Operation Failed when attempting to write 0x01 Start DFU to DFU Control Point

[minerdev]

Hi, 

I'm getting back "01 10 06" when attempting to send 0x01 Start DFU to the DFU Control Point from my gateway which is a Pi3 running Noble. Notifications are enabled. With the NRF ToolBox I do not seem to get this error. If I send 0x05 or 0x06 from the gateway, the peripheral reboots perfectly fine. 

Code:

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static _reconnect(peripheral) {

peripheral.once('disconnect', (error)=>{

console.log("Final d/c")

})

peripheral.connect((error)=>{

console.log("Connected, about to send 0x01 to control point")

peripheral.discoverServices([DFU_UPDATE_SERVICE], (error_, services) => {

let dfuService = services[0]

dfuService.discoverCharacteristics([DFU_CONTROL_POINT, DFU_PACKET_CHAR], (error__, characteristics) => {

let controlPointChar = characteristics[1]

let dfuPacketChar = characteristics[0]

// Must enable notifications (subscribe in Noble) to write to control point

this._initResponseListener(controlPointChar)

controlPointChar.subscribe((er)=>{

let dat = Buffer.from(new Uint8Array([START_DFU]))

// Notification param must be false

controlPointChar.write(dat, false, (error___) => {

console.log("Wrote 0x01 to Ctrl Pt..", error___)

})

//this._sendImageSize(controlPointChar, dfuPacketChar)

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

 static _reconnect(peripheral) {
    peripheral.once('disconnect', (error)=>{
      console.log("Final d/c")
    })
    peripheral.connect((error)=>{
      console.log("Connected, about to send 0x01 to control point")
      peripheral.discoverServices([DFU_UPDATE_SERVICE], (error_, services) => {
        let dfuService = services[0]
        dfuService.discoverCharacteristics([DFU_CONTROL_POINT, DFU_PACKET_CHAR], (error__, characteristics) => {
          let controlPointChar = characteristics[1]
          let dfuPacketChar = characteristics[0]
          // Must enable notifications (subscribe in Noble) to write to control point
          this._initResponseListener(controlPointChar)
          controlPointChar.subscribe((er)=>{
            let dat = Buffer.from(new Uint8Array([START_DFU]))
            // Notification param must be false

            controlPointChar.write(dat, false, (error___) => {
              console.log("Wrote 0x01 to Ctrl Pt..", error___)
            })
                        //this._sendImageSize(controlPointChar, dfuPacketChar)
          })
       })
      })
    })
  }

  static _initResponseListener(controlPointChar) {
    controlPointChar.on('data', (data, isNotification)=>{
      console.log("Control pt res:", data)
      console.log("isNotif:", isNotification)
    })
  }

Logs:

Connected, about to send 0x01 to control point
Wrote 0x01 to Ctrl Pt.. null
Control pt res: <Buffer 10 01 06>
isNotif: true