[Help]: Slow data transmission with Phomemo thermal printer

max-h-silverman commented 7 months ago

Requirements

[X] I've looked at the README 'Common Problems' section

Have you checked this problem on the example app?

No

FlutterBluePlus Version

1.32.4

Flutter Version

3.19.1

What OS?

Android

OS Version

Android 12

Bluetooth Module

Unsure (Phomemo M220 thermal printer)

What is your problem?

When sending image data to the printer using FBP the transmission takes about 3s (about 100ms per 256 bytes, roughly 30 packets). When sending the exact same data using the native Phomemo PrintMaster app, the transmission takes about 1/10th as long.

I've spent a few days digging into this to try and understand if my implementation isn't right, but it ultimately seems that the delay is happening in Flutter_Blue_plus.java. (logs below show a few of the calls.

I added detailed logging at one point to see more granular detail about where the time is being taken, and the relevant log capture is attached.

I retrieved the HCI Log from the device to confirm that the same amount of data is being transmitted by PrintMaster and by my app.

Appreciate any help you can offer.

Logs

2024-05-01 22:29:16.237 25074-25074 [FBP-Android]           com.flutterflow.mycofile             D  [FBP] onMethodCall: discoverServices
2024-05-01 22:29:16.237 25074-25074 BluetoothGatt           com.flutterflow.mycofile             D  discoverServices() - device: 04:7F:0E:AC:C9:0F
2024-05-01 22:29:16.240 25074-25189 BluetoothGatt           com.flutterflow.mycofile             D  onSearchComplete() = Device=04:7F:0E:AC:C9:0F Status=0
2024-05-01 22:29:16.241 25074-25189 [FBP-Android]           com.flutterflow.mycofile             D  [FBP] onServicesDiscovered:
2024-05-01 22:29:16.241 25074-25189 [FBP-Android]           com.flutterflow.mycofile             D  [FBP]   count: 7
2024-05-01 22:29:16.241 25074-25189 [FBP-Android]           com.flutterflow.mycofile             D  [FBP]   status: 0GATT_SUCCESS
2024-05-01 22:29:16.261 25074-25134 flutter                 com.flutterflow.mycofile             I  Data sent (hex): 1b 40 1d 76 30 00 28 00 b7 00
2024-05-01 22:29:16.265 25074-25074 [FBP-Android]           com.flutterflow.mycofile             D  [FBP] onMethodCall: writeCharacteristic
2024-05-01 22:29:16.394 25074-25189 [FBP-Android]           com.flutterflow.mycofile             D  [FBP] onCharacteristicWrite:
2024-05-01 22:29:16.395 25074-25189 [FBP-Android]           com.flutterflow.mycofile             D  [FBP]   chr: 49535343-6daa-4d02-abf6-19569aca69fe
2024-05-01 22:29:16.395 25074-25189 [FBP-Android]           com.flutterflow.mycofile             D  [FBP]   status: GATT_SUCCESS (0)
2024-05-01 22:29:16.402 25074-25074 [FBP-Android]           com.flutterflow.mycofile             D  [FBP] onMethodCall: discoverServices
2024-05-01 22:29:16.402 25074-25074 BluetoothGatt           com.flutterflow.mycofile             D  discoverServices() - device: 04:7F:0E:AC:C9:0F
2024-05-01 22:29:16.405 25074-25189 BluetoothGatt           com.flutterflow.mycofile             D  onSearchComplete() = Device=04:7F:0E:AC:C9:0F Status=0
2024-05-01 22:29:16.405 25074-25189 [FBP-Android]           com.flutterflow.mycofile             D  [FBP] onServicesDiscovered:
2024-05-01 22:29:16.405 25074-25189 [FBP-Android]           com.flutterflow.mycofile             D  [FBP]   count: 7
2024-05-01 22:29:16.405 25074-25189 [FBP-Android]           com.flutterflow.mycofile             D  [FBP]   status: 0GATT_SUCCESS
2024-05-01 22:29:16.422 25074-25134 flutter                 com.flutterflow.mycofile             I  Data sent (hex): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
2024-05-01 22:29:16.425 25074-25074 [FBP-Android]           com.flutterflow.mycofile             D  [FBP] onMethodCall: writeCharacteristic
2024-05-01 22:29:16.665 25074-25189 [FBP-Android]           com.flutterflow.mycofile             D  [FBP] onCharacteristicWrite:
2024-05-01 22:29:16.666 25074-25189 [FBP-Android]           com.flutterflow.mycofile             D  [FBP]   chr: 49535343-6daa-4d02-abf6-19569aca69fe
2024-05-01 22:29:16.666 25074-25189 [FBP-Android]           com.flutterflow.mycofile             D  [FBP]   status: GATT_SUCCESS (0)
2024-05-01 22:29:16.671 25074-25074 [FBP-Android]           com.flutterflow.mycofile             D  [FBP] onMethodCall: discoverServices
2024-05-01 22:29:16.672 25074-25074 BluetoothGatt           com.flutterflow.mycofile             D  discoverServices() - device: 04:7F:0E:AC:C9:0F
2024-05-01 22:29:16.676 25074-25189 BluetoothGatt           com.flutterflow.mycofile             D  onSearchComplete() = Device=04:7F:0E:AC:C9:0F Status=0
2024-05-01 22:29:16.676 25074-25189 [FBP-Android]           com.flutterflow.mycofile             D  [FBP] onServicesDiscovered:
2024-05-01 22:29:16.676 25074-25189 [FBP-Android]           com.flutterflow.mycofile             D  [FBP]   count: 7
2024-05-01 22:29:16.676 25074-25189 [FBP-Android]           com.flutterflow.mycofile             D  [FBP]   status: 0GATT_SUCCESS
2024-05-01 22:29:16.704 25074-25134 flutter                 com.flutterflow.mycofile             I  Data sent (hex): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
2024-05-01 22:29:16.706 25074-25074 [FBP-Android]           com.flutterflow.mycofile             D  [FBP] onMethodCall: writeCharacteristic
2024-05-01 22:29:16.980 25074-25189 [FBP-Android]           com.flutterflow.mycofile             D  [FBP] onCharacteristicWrite:
2024-05-01 22:29:16.981 25074-25189 [FBP-Android]           com.flutterflow.mycofile             D  [FBP]   chr: 49535343-6daa-4d02-abf6-19569aca69fe
2024-05-01 22:29:16.981 25074-25189 [FBP-Android]           com.flutterflow.mycofile             D  [FBP]   status: GATT_SUCCESS (0)
2024-05-01 22:29:16.988 25074-25074 [FBP-Android]           com.flutterflow.mycofile             D  [FBP] onMethodCall: discoverServices
2024-05-01 22:29:16.988 25074-25074 BluetoothGatt           com.flutterflow.mycofile             D  discoverServices() - device: 04:7F:0E:AC:C9:0F
2024-05-01 22:29:16.992 25074-25189 BluetoothGatt           com.flutterflow.mycofile             D  onSearchComplete() = Device=04:7F:0E:AC:C9:0F Status=0
2024-05-01 22:29:16.993 25074-25189 [FBP-Android]           com.flutterflow.mycofile             D  [FBP] onServicesDiscovered:
2024-05-01 22:29:16.993 25074-25189 [FBP-Android]           com.flutterflow.mycofile             D  [FBP]   count: 7
2024-05-01 22:29:16.993 25074-25189 [FBP-Android]           com.flutterflow.mycofile             D  [FBP]   status: 0GATT_SUCCESS
2024-05-01 22:29:17.023 25074-25134 flutter                 com.flutterflow.mycofile             I  Data sent (hex): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
2024-05-01 22:29:17.024 25074-25074 [FBP-Android]           com.flutterflow.mycofile             D  [FBP] onMethodCall: writeCharacteristic
2024-05-01 22:29:17.295 25074-25189 [FBP-Android]           com.flutterflow.mycofile             D  [FBP] onCharacteristicWrite:
2024-05-01 22:29:17.296 25074-25189 [FBP-Android]           com.flutterflow.mycofile             D  [FBP]   chr: 49535343-6daa-4d02-abf6-19569aca69fe
2024-05-01 22:29:17.296 25074-25189 [FBP-Android]           com.flutterflow.mycofile             D  [FBP]   status: GATT_SUCCESS (0)
2024-05-01 22:29:17.302 25074-25074 [FBP-Android]           com.flutterflow.mycofile             D  [FBP] onMethodCall: discoverServices
2024-05-01 22:29:17.302 25074-25074 BluetoothGatt           com.flutterflow.mycofile             D  discoverServices() - device: 04:7F:0E:AC:C9:0F
2024-05-01 22:29:17.307 25074-25189 BluetoothGatt           com.flutterflow.mycofile             D  onSearchComplete() = Device=04:7F:0E:AC:C9:0F Status=0
2024-05-01 22:29:17.307 25074-25189 [FBP-Android]           com.flutterflow.mycofile             D  [FBP] onServicesDiscovered:
2024-05-01 22:29:17.307 25074-25189 [FBP-Android]           com.flutterflow.mycofile             D  [FBP]   count: 7
2024-05-01 22:29:17.307 25074-25189 [FBP-Android]           com.flutterflow.mycofile             D  [FBP]   status: 0GATT_SUCCESS
2024-05-01 22:29:17.334 25074-25134 flutter                 com.flutterflow.mycofile             I  Data sent (hex): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3c 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 1f fc 00 00 00 00 00 3c 00 00 00 00 ff ff c0 00 00 00 00 00 1f 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 1f ff 80 00 00 00 00 3c 00 00 00 00 ff ff c0 00 00 00 00 00 7f c0
2024-05-01 22:29:17.336 25074-25074 [FBP-Android]           com.flutterflow.mycofile             D  [FBP] onMethodCall: writeCharacteristic
2024-05-01 22:29:17.655 25074-25189 [FBP-Android]           com.flutterflow.mycofile             D  [FBP] onCharacteristicWrite:
2024-05-01 22:29:17.656 25074-25189 [FBP-Android]           com.flutterflow.mycofile             D  [FBP]   chr: 49535343-6daa-4d02-abf6-19569aca69fe
2024-05-01 22:29:17.656 25074-25189 [FBP-Android]           com.flutterflow.mycofile             D  [FBP]   status: GATT_SUCCESS (0)
2024-05-01 22:29:17.662 25074-25074 [FBP-Android]           com.flutterflow.mycofile             D  [FBP] onMethodCall: discoverServices
2024-05-01 22:29:17.662 25074-25074 BluetoothGatt           com.flutterflow.mycofile             D  discoverServices() - device: 04:7F:0E:AC:C9:0F
2024-05-01 22:29:17.667 25074-25189 BluetoothGatt           com.flutterflow.mycofile             D  onSearchComplete() = Device=04:7F:0E:AC:C9:0F Status=0
2024-05-01 22:29:17.667 25074-25189 [FBP-Android]           com.flutterflow.mycofile             D  [FBP] onServicesDiscovered:
2024-05-01 22:29:17.667 25074-25189 [FBP-Android]           com.flutterflow.mycofile             D  [FBP]   count: 7
2024-05-01 22:29:17.667 25074-25189 [FBP-Android]           com.flutterflow.mycofile             D  [FBP]   status: 0GATT_SUCCESS
2024-05-01 22:29:17.696 25074-25134 flutter                 com.flutterflow.mycofile             I  Data sent (hex): 00 00 00 00 1e 00 00 00 00 00 00 00 00 00 00 00 00 00 1f ff e0 00 00 00 00 3c 00 00 00 00 ff ff c0 00 00 00 00 00 ff f0 00 00 00 00 1e 00 00 00 00 00 00 00 00 00 00 00 00 00 1f ff e0 00 00 00 00 3c 00 00 00 00 ff ff c0 00 00 00 00 01 ff f8 00 00 00 00 1e 00 00 00 00 00 00 00 00 00 00 00 00 00 1f 01 e0 00 00 00 00 3c 00 00 00 00 01 e0 00 00 00 00 00 07 c0 f8 00 00 00 00 1e 00 00 00 00 00 00 00 00 00 00 00 00 00 1f 01 f0 0f 80 03 c0 3c 3e 78 1e 00 01 e0 03 e0 1e 3c 00 07 c0 7c 78 1f 07 c0 ff c0 7c 07 ce 00 00 00 00 00 00 00 00 00 1f 01 f0 3f e0 1f f0 3c 3e 78 1e 00 01 e0 0f f8 1e fe 00 0f c0 3c 78 1e 0f f8 ff c0 ff 07 fe 00 00 00 00 00 00 00 00 00 1f 01 f0 7f f0 3f f8 3c 7c 78 1e 00 01 e0 0f fc 1f ff 00 0f 80 3c 3c 1e 1f fc ff c3 ff 87 fe 00 00 00 00 00 00 00
2024-05-01 22:29:17.698 25074-25074 [FBP-Android]           com.flutterflow.mycofile             D  [FBP] onMethodCall: writeCharacteristic
2024-05-01 22:29:18.015 25074-25089 [FBP-Android]           com.flutterflow.mycofile             D  [FBP] onCharacteristicWrite:
2024-05-01 22:29:18.016 25074-25089 [FBP-Android]           com.flutterflow.mycofile             D  [FBP]   chr: 49535343-6daa-4d02-abf6-19569aca69fe
2024-05-01 22:29:18.016 25074-25089 [FBP-Android]           com.flutterflow.mycofile             D  [FBP]   status: GATT_SUCCESS (0)
2024-05-01 22:29:18.022 25074-25074 [FBP-Android]           com.flutterflow.mycofile             D  [FBP] onMethodCall: discoverServices
2024-05-01 22:29:18.022 25074-25074 BluetoothGatt           com.flutterflow.mycofile             D  discoverServices() - device: 04:7F:0E:AC:C9:0F
2024-05-01 22:29:18.027 25074-25089 BluetoothGatt           com.flutterflow.mycofile             D  onSearchComplete() = Device=04:7F:0E:AC:C9:0F Status=0
2024-05-01 22:29:18.027 25074-25089 [FBP-Android]           com.flutterflow.mycofile             D  [FBP] onServicesDiscovered:
2024-05-01 22:29:18.027 25074-25089 [FBP-Android]           com.flutterflow.mycofile             D  [FBP]   count: 7
2024-05-01 22:29:18.028 25074-25089 [FBP-Android]           com.flutterflow.mycofile             D  [FBP]   status: 0GATT_SUCCESS
2024-05-01 22:29:18.060 25074-25134 flutter                 com.flutterflow.mycofile             I  Data sent (hex): 00 00 1f 01 e0 ff f0 3f f8 3c fc 3c 3e 00 01 e0 1f fe 1f ff 00 0f 80 3c 3c 1e 3f fe 7f c3 ff c7 fe 00 00 00 00 00 00 00 00 00 1f 01 e0 f8 f8 3c 7c 3c f8 3c 3e 00 01 e0 3e 3e 1f 8f 80 0f 80 3e 3c 3c 3c 3e 1e 07 c3 c7 fe 00 00 00 00 00 00 00 00 00 1f ff e1 e0 7c 78 1c 3f e0 1e 3c 00 01 e0 78 1f 1f 07 80 0f 80 3e 1e 3c 3c 00 1e 0f 03 e7 c0 00 00 00 00 00 00 00 00 00 1f ff c1 e0 3c 78 00 3f c0 1e 3c 00 01 e0 78 0f 1e 07 80 0f 80 3e 1e 7c 3e 00 1e 0f 03 e7 c0 00 00 00 00 00 00 00 00 00 1f ff 81 e0 3c 78 00 3f c0 1e 3c 00 01 e0 78 0f 1e 03 c0 0f 80 3e 1e 7c 1f c0 1e 0f ff e7 c0 00 00 00 00 00 00 00 00 00 1f ff 01 e0 3c 78 00 3f e0 0f 38 00 01 e0 78 0f 1e 03 c0 0f 80 3e 1f 7c 1f f0 1e 0f ff e7 c0 00 00 00 00 00 00 00 00 00 1f 0f 81 e0 3c 78 00 3f e0 0f 78 00 01 e0
2024-05-01 22:29:18.062 25074-25074 [FBP-Android]           com.flutterflow.mycofile             D  [FBP] onMethodCall: writeCharacteristic
2024-05-01 22:29:18.330 25074-25089 [FBP-Android]           com.flutterflow.mycofile             D  [FBP] onCharacteristicWrite:
2024-05-01 22:29:18.330 25074-25089 [FBP-Android]           com.flutterflow.mycofile             D  [FBP]   chr: 49535343-6daa-4d02-abf6-19569aca69fe
2024-05-01 22:29:18.330 25074-25089 [FBP-Android]           com.flutterflow.mycofile             D  [FBP]   status: GATT_SUCCESS (0)
2024-05-01 22:29:18.336 25074-25074 [FBP-Android]           com.flutterflow.mycofile             D  [FBP] onMethodCall: discoverServices
2024-05-01 22:29:18.336 25074-25074 BluetoothGatt           com.flutterflow.mycofile             D  discoverServices() - device: 04:7F:0E:AC:C9:0F
2024-05-01 22:29:18.341 25074-25089 BluetoothGatt           com.flutterflow.mycofile             D  onSearchComplete() = Device=04:7F:0E:AC:C9:0F Status=0
2024-05-01 22:29:18.341 25074-25089 [FBP-Android]           com.flutterflow.mycofile             D  [FBP] onServicesDiscovered:
2024-05-01 22:29:18.341 25074-25089 [FBP-Android]           com.flutterflow.mycofile             D  [FBP]   count: 7
2024-05-01 22:29:18.342 25074-25089 [FBP-Android]           com.flutterflow.mycofile             D  [FBP]   status: 0GATT_SUCCESS

chipweinberger commented 7 months ago

FBP only allows a single transaction in progress at one time.

This is for best reliability on all android versions and phones.

this locking happens in dart code, in the writeCharacteristic function

you can try to remove this lock, or move the lock to native code so there is reduced latency

this will require careful coding tho.

if you manage it, please open a pr

chipweinberger commented 7 months ago

however a bigger issue - why are you discovering services so much?

that will destroy performance

max-h-silverman commented 7 months ago

Ok thanks. I'm using a third party package written for the Phomemo printer and the "sendData" function doesn't accept the characteristic as a parameter. I was able to modify the package locally to send the previously discovered write characteristic but it didn't change the overall time to complete the print.

Which part of the writeCharacteristic function is performing the lock?

Appreciate the quick response.

chipweinberger commented 7 months ago

you need to not discover services after every write. that is your problem

max-h-silverman commented 7 months ago

Sorry what I was trying to say in the last note is that's what I tried but didn't see any performance increase. Below are the first few logs from that attempt. You can see the large time gap between "[FBP] onMethodCall: writeCharacteristic" and "[FBP] onCharacteristicWrite:" with no discovery happening after the initial one.

2024-05-02 10:49:41.732 32655-32655 [FBP-Android] 2024-05-02 10:49:41.732 32655-32655 BluetoothGatt 2024-05-02 10:49:41.741 32655-32694 BluetoothGatt 2024-05-02 10:49:41.742 32655-32694 [FBP-Android] 2024-05-02 10:49:41.742 32655-32694 [FBP-Android] 2024-05-02 10:49:41.742 32655-32694 [FBP-Android] 2024-05-02 10:49:42.084 32655-32655 [FBP-Android] 2024-05-02 10:49:42.170 32655-32694 [FBP-Android] 2024-05-02 10:49:42.171 32655-32694 [FBP-Android] 2024-05-02 10:49:42.171 32655-32694 [FBP-Android] 2024-05-02 10:49:42.175 32655-32754 flutter 2024-05-02 10:49:42.178 32655-32655 [FBP-Android] 2024-05-02 10:49:42.441 32655-32694 [FBP-Android] 2024-05-02 10:49:42.442 32655-32694 [FBP-Android] 2024-05-02 10:49:42.442 32655-32694 [FBP-Android] 2024-05-02 10:49:42.450 32655-32754 flutter 2024-05-02 10:49:42.453 32655-32655 [FBP-Android] 2024-05-02 10:49:42.710 32655-32694 [FBP-Android] 2024-05-02 10:49:42.711 32655-32694 [FBP-Android] 2024-05-02 10:49:42.711 32655-32694 [FBP-Android] 2024-05-02 10:49:42.716 32655-32754 flutter 2024-05-02 10:49:42.719 32655-32655 [FBP-Android] 2024-05-02 10:49:42.981 32655-32694 [FBP-Android] 2024-05-02 10:49:42.981 32655-32694 [FBP-Android] 2024-05-02 10:49:42.982 32655-32694 [FBP-Android] 2024-05-02 10:49:42.988 32655-32754 flutter 2024-05-02 10:49:42.991 32655-32655 [FBP-Android] 2024-05-02 10:49:43.251 32655-32694 [FBP-Android] 2024-05-02 10:49:43.251 32655-32694 [FBP-Android] 2024-05-02 10:49:43.251 32655-32694 [FBP-Android] 2024-05-02 10:49:43.256 32655-32754 flutter com.flutterflow.mycofile D [FBP] onMethodCall: discoverServices com.flutterflow.mycofile D discoverServices() - device: 04:7F:0E:AC:C9:0F com.flutterflow.mycofile D onSearchComplete() = Device=04:7F:0E:AC:C9:0F Status=0 com.flutterflow.mycofile D [FBP] onServicesDiscovered: com.flutterflow.mycofile D [FBP] count: 7 com.flutterflow.mycofile D [FBP] status: 0GATT_SUCCESS com.flutterflow.mycofile D [FBP] onMethodCall: writeCharacteristic com.flutterflow.mycofile D [FBP] onCharacteristicWrite: com.flutterflow.mycofile D [FBP] chr: 49535343-6daa-4d02-abf6-19569aca69fe com.flutterflow.mycofile D [FBP] status: GATT_SUCCESS (0) com.flutterflow.mycofile I Data sent successfully com.flutterflow.mycofile D [FBP] onMethodCall: writeCharacteristic com.flutterflow.mycofile D [FBP] onCharacteristicWrite: com.flutterflow.mycofile D [FBP] chr: 49535343-6daa-4d02-abf6-19569aca69fe com.flutterflow.mycofile D [FBP] status: GATT_SUCCESS (0) com.flutterflow.mycofile I Data sent successfully com.flutterflow.mycofile D [FBP] onMethodCall: writeCharacteristic com.flutterflow.mycofile D [FBP] onCharacteristicWrite: com.flutterflow.mycofile D [FBP] chr: 49535343-6daa-4d02-abf6-19569aca69fe com.flutterflow.mycofile D [FBP] status: GATT_SUCCESS (0) com.flutterflow.mycofile I Data sent successfully com.flutterflow.mycofile D [FBP] onMethodCall: writeCharacteristic com.flutterflow.mycofile D [FBP] onCharacteristicWrite: com.flutterflow.mycofile D [FBP] chr: 49535343-6daa-4d02-abf6-19569aca69fe com.flutterflow.mycofile D [FBP] status: GATT_SUCCESS (0) com.flutterflow.mycofile I Data sent successfully com.flutterflow.mycofile D [FBP] onMethodCall: writeCharacteristic com.flutterflow.mycofile D [FBP] onCharacteristicWrite: com.flutterflow.mycofile D [FBP] chr: 49535343-6daa-4d02-abf6-19569aca69fe com.flutterflow.mycofile D [FBP] status: GATT_SUCCESS (0) com.flutterflow.mycofile I Data sent successfully

chipweinberger commented 7 months ago

you should also increase the android PHY speed

search FBP for the word PHY

max-h-silverman commented 5 months ago

Hey I wasn't able to identify the code responsible for this lock in writeCharacteristic. Can you point me to it? Thanks.

chipweinberger / flutter_blue_plus