cordova-plugin-ble-central: Invalid UUID

I’m struggling while trying to write to some characteristics on a ble device. I’ve successfully written to 1 characteristic in the past, but I’ve been running into this error when I try to write to multiple characteristics in succession. I’m running each write as a callback for the previous ones, so that should be fine. I’ve attached the console output. One problem that I noticed is that it isn’t printing out the characteristics even though I used JSON.stringify on the device object. My repo is here:

https://github.com/lab11/eink

with the important file in js/index.js

What exactly is going wrong? Thanks! Any help would be appreciated.

error

I/chromium(16493): [INFO:CONSOLE(173)] "CLICKED!", source: https://rawgit.com/lab11/eink/master/software/summon/plugins/cordova-plugin-console/www/console-via-logger.js (173) I/chromium(16493): [INFO:CONSOLE(173)] "onEnable", source: https://rawgit.com/lab11/eink/master/software/summon/plugins/cordova-plugin-console/www/console-via-logger.js (173) I/chromium(16493): [INFO:CONSOLE(173)] "Connection error: [object Object]", source: https://rawgit.com/lab11/eink/master/software/summon/plugins/cordova-plugin-console/www/console-via-logger.js (173) I/chromium(16493): [INFO:CONSOLE(173)] "CONNECTION SUCCESSFUL", source: https://rawgit.com/lab11/eink/master/software/summon/plugins/cordova-plugin-console/www/console-via-logger.js (173) I/chromium(16493): [INFO:CONSOLE(173)] "{ I/chromium(16493): "id": "C0:98:E5:00:F8:02", I/chromium(16493): "advertising": {}, I/chromium(16493): "rssi": -64, I/chromium(16493): "advertisement": { I/chromium(16493): "serviceUuids": [ I/chromium(16493): "FEAA" I/chromium(16493): ], I/chromium(16493): "serviceData": [ I/chromium(16493): { I/chromium(16493): "uuid": "FEAA", I/chromium(16493): "data": { I/chromium(16493): "0": 16, I/chromium(16493): "1": 186, I/chromium(16493): "2": 2, I/chromium(16493): "3": 103, I/chromium(16493): "4": 111, I/chromium(16493): "5": 111, I/chromium(16493): "6": 46, I/chromium(16493): "7": 103, I/chromium(16493): "8": 108, I/chromium(16493): "9": 47, I/chromium(16493): "10": 112, I/chromium(16493): "11": 75, I/chromium(16493): "12": 105, I/chromium(16493): "13": 76, I/chromium(16493): "14": 87, I/chromium(16493): "15": 53 I/chromium(16493): } I/chromium(16493): } I/chromium(16493): ], I/chromium(16493): "flags": 6 I/chromium(16493): } I/chromium(16493): }", source: https://rawgit.com/lab11/eink/master/software/summon/plugins/cordova-plugin-console/www/console-via-logger.js (173) I/chromium(16493): [INFO:CONSOLE(173)] "created buffer", source: https://rawgit.com/lab11/eink/master/software/summon/plugins/cordova-plugin-console/www/console-via-logger.js (173) I/chromium(16493): [INFO:CONSOLE(173)] "started write", source: https://rawgit.com/lab11/eink/master/software/summon/plugins/cordova-plugin-console/www/console-via-logger.js (173) I/chromium(16493): [INFO:CONSOLE(173)] "error: Invalid UUID: E528A411FF4F3089D44F7CB505ABA641", source: https://rawgit.com/lab11/eink/master/software/summon/plugins/cordova-plugin-console/www/console-via-logger.js (173) I/chromium(16493): [INFO:CONSOLE(173)] "error: Invalid UUID: E528A411FF4F3089D44F7CB505ABA641", source: https://rawgit.com/lab11/eink/master/software/summon/plugins/cordova-plugin-console/www/console-via-logger.js (173) I/chromium(16493): [INFO:CONSOLE(173)] "error: Invalid UUID: E528A411FF4F3089D44F7CB505ABA641", source: https://rawgit.com/lab11/eink/master/software/summon/plugins/cordova-plugin-console/www/console-via-logger.js (173) I/chromium(16493): [INFO:CONSOLE(173)] "error: Invalid UUID: E528A411FF4F3089D44F7CB505ABA641", source: https://rawgit.com/lab11/eink/master/software/summon/plugins/cordova-plugin-console/www/console-via-logger.js (173) I/chromium(16493): [INFO:CONSOLE(173)] "error: Invalid UUID: E528A411FF4F3089D44F7CB505ABA641", source: https://rawgit.com/lab11/eink/master/software/summon/plugins/cordova-plugin-console/www/console-via-logger.js (173)

About this issue

Original URL
State: closed
Created 8 years ago
Comments: 15 (6 by maintainers)

Commits related to this issue

rev74: https://github.com/don/cordova-plugin-ble-central/issues/270#issuecomment-230790264 — committed to lab11/eink by ColeHud 8 years ago

Most upvoted comments

That error is from Android, the plugin is just passing the error along to you. The MTU for a characteristic is usually 20 bytes. The peripheral need to support large characteristics, some only support 20 bytes. iOS and Android will chunk data and send blob requests for larger characteristics. iOS and new Android devices are pretty solid up to the max of 500 bytes. With older android versions/devices I’ve seen them fail with over 100 bytes.

If the app that works runs on your Android phone, they might be formatting the data different or chunking the data different. Try enabling the HCI debug log in Android settings and see what’s happening.

don on Jul 5, 2016

My coworker informed me that the screenshots aren’t up to par, so here’s the output in text form.

I/chromium(13073): [INFO:CONSOLE(173)] "CLICKED!", source: https://rawgit.com/lab11/eink/master/software/summon/plugins/cordova-plugin-console/www/console-via-logger.js (173)
I/chromium(13073): [INFO:CONSOLE(173)] "onEnable", source: https://rawgit.com/lab11/eink/master/software/summon/plugins/cordova-plugin-console/www/console-via-logger.js (173)
I/chromium(13073): [INFO:CONSOLE(173)] "CONNECTION SUCCESSFUL", source: https://rawgit.com/lab11/eink/master/software/summon/plugins/cordova-plugin-console/www/console-via-logger.js (173)
I/chromium(13073): [INFO:CONSOLE(173)] "{
I/chromium(13073):   "id": "C0:98:E5:00:F8:02",
I/chromium(13073):   "advertising": {},
I/chromium(13073):   "rssi": -68,
I/chromium(13073):   "services": [
I/chromium(13073):     "1800",
I/chromium(13073):     "1801",
I/chromium(13073):     "e528a44a-ff4f-3089-d44f-7cb505aba641"
I/chromium(13073):   ],
I/chromium(13073):   "characteristics": [
I/chromium(13073):     {
I/chromium(13073):       "service": "1800",
I/chromium(13073):       "characteristic": "2a00",
I/chromium(13073):       "properties": [
I/chromium(13073):         "Read",
I/chromium(13073):         "Write"
I/chromium(13073):       ]
I/chromium(13073):     },
I/chromium(13073):     {
I/chromium(13073):       "service": "1800",
I/chromium(13073):       "characteristic": "2a01",
I/chromium(13073):       "properties": [
I/chromium(13073):         "Read"
I/chromium(13073):       ]
I/chromium(13073):     },
I/chromium(13073):     {
I/chromium(13073):       "service": "1800",
I/chromium(13073):       "characteristic": "2a04",
I/chromium(13073):       "properties": [
I/chromium(13073):         "Read"
I/chromium(13073):       ]
I/chromium(13073):     },
I/chromium(13073):     {
I/chromium(13073):       "service": "e528a44a-ff4f-3089-d44f-7cb505aba641",
I/chromium(13073):       "characteristic": "e528a411-ff4f-3089-d44f-7cb505aba641",
I/chromium(13073):       "properties": [
I/chromium(13073):         "Write"
I/chromium(13073):       ]
I/chromium(13073):     },
I/chromium(13073):     {
I/chromium(13073):       "service": "e528a44a-ff4f-3089-d44f-7cb505aba641",
I/chromium(13073):       "characteristic": "e528a412-ff4f-3089-d44f-7cb505aba641",
I/chromium(13073):       "properties": [
I/chromium(13073):         "Write"
I/chromium(13073):       ]
I/chromium(13073):     },
I/chromium(13073):     {
I/chromium(13073):       "service": "e528a44a-ff4f-3089-d44f-7cb505aba641",
I/chromium(13073):       "characteristic": "e528a413-ff4f-3089-d44f-7cb505aba641",
I/chromium(13073):       "properties": [
I/chromium(13073):         "Write"
I/chromium(13073):       ]
I/chromium(13073):     },
I/chromium(13073):     {
I/chromium(13073):       "service": "e528a44a-ff4f-3089-d44f-7cb505aba641",
I/chromium(13073):       "characteristic": "e528a410-ff4f-3089-d44f-7cb505aba641",
I/chromium(13073):       "properties": [
I/chromium(13073):         "Write"
I/chromium(13073):       ]
I/chromium(13073):     },
I/chromium(13073):     {
I/chromium(13073):       "service": "e528a44a-ff4f-3089-d44f-7cb505aba641",
I/chromium(13073):       "characteristic": "e528a414-ff4f-3089-d44f-7cb505aba641",
I/chromium(13073):       "properties": [
I/chromium(13073):         "Write"
I/chromium(13073):       ]
I/chromium(13073):     }
I/chromium(13073):   ]
I/chromium(13073): }", source: https://rawgit.com/lab11/eink/master/software/summon/plugins/cordova-plugin-console/www/console-via-logger.js (173)
I/chromium(13073): [INFO:CONSOLE(173)] "created buffer", source: https://rawgit.com/lab11/eink/master/software/summon/plugins/cordova-plugin-console/www/console-via-logger.js (173)
I/chromium(13073): [INFO:CONSOLE(173)] "started write", source: https://rawgit.com/lab11/eink/master/software/summon/plugins/cordova-plugin-console/www/console-via-logger.js (173)
I/chromium(13073): [INFO:CONSOLE(173)] "error: Characteristic e528a411-ff4f-3089-d44f-7cb505aba641 not found.", source: https://rawgit.com/lab11/eink/master/software/summon/plugins/cordova-plugin-console/www/console-via-logger.js (173)
I/chromium(13073): [INFO:CONSOLE(173)] "error: Characteristic e528a411-ff4f-3089-d44f-7cb505aba641 not found.", source: https://rawgit.com/lab11/eink/master/software/summon/plugins/cordova-plugin-console/www/console-via-logger.js (173)
I/chromium(13073): [INFO:CONSOLE(173)] "error: Characteristic e528a411-ff4f-3089-d44f-7cb505aba641 not found.", source: https://rawgit.com/lab11/eink/master/software/summon/plugins/cordova-plugin-console/www/console-via-logger.js (173)
I/chromium(13073): [INFO:CONSOLE(173)] "error: Characteristic e528a411-ff4f-3089-d44f-7cb505aba641 not found.", source: https://rawgit.com/lab11/eink/master/software/summon/plugins/cordova-plugin-console/www/console-via-logger.js (173)
I/chromium(13073): [INFO:CONSOLE(173)] "error: Characteristic e528a411-ff4f-3089-d44f-7cb505aba641 not found.", source: https://rawgit.com/lab11/eink/master/software/summon/plugins/cordova-plugin-console/www/console-via-logger.js (173)

ColeHud on Jul 1, 2016

UUIDs aren’t valid without the dashes

// OK
var textUuid   = "E528A410-FF4F-3089-D44F-7CB505ABA641"; 
// INVALID
var xcoordUuid = "E528A411FF4F3089D44F7CB505ABA641";

A peripheral object is passed to the success callback for ble.connect. If you log that object console.log(JSON.stringify(peripheral) you’ll get a list of the characteristics and properties. Make sure your code matches the details from the peripheral.

don on Jul 1, 2016