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A BLE connection is made between a central device and a peripheral device. In most cases the Android device will be the central device. Beacons, heart rate sensors and other BLE devices are implemented as peripheral device. However the Android device can also implement the peripheral role. This is

WriteData (Service As String, Characteristic As String, Data() As Byte) Is there a way to write a large string or series of values with this method? for example 102,111,254,254,126,050 when I try to write those values to the arduino i only get the first block of value. (102) Android has a BLEStringC
link: If your Arduino is set up to look like a BLE device with a(t least one) writeable characteristic to accept the multibyte data, then: yes. I have a va
link: Thanks for the response. I have done as you suggest however I still am only able to get the first block of numbers. Since everything is compiling and
link: I got all of my information from the B4A BLEExample. To write data from b4a you use the WriteData method. In the peripheral device in my case an ardui

I am using :- manager.WriteData(serveuuid,txuuid,n.GetBytes("utf8")) Where serveruuid is the remote ble service txuuid is the remote ble characteristic n is a string containing hex value from 0000 to FFFF What I receive at the other end is 3030 to 6666. Why is that and How can I correctly s
link: Cracked this one as well after getting close to giving up Dim n As String ="ffff" Dim send()As Byte=bc.HexToBytes(n) manager.WriteData(serveuui

HexToBytes(myStr) 'manager.WriteData(serveuuid,txuuid, myStr.GetBytes("utf8")) 'manager.WriteData(serveuuid,txuuid, send) sndArray(0) = 120 sndArray(1) = 0x13 sndArray(2) = 0x0a manager.WriteData(serveuuid,txuuid, sndArray) flipflop =
link: It is strange that it works with BleExtEx and not with BLE2. I'm not familiar with BleExtEx source code but I guess that it calls the same underlying
link: I found an old post where BleExtEx was updated to correct writes. I don't understand the java code that is zipped in the post. I don't see anything re
link: changed char to charact and Object to JavaObject in WriteData sub : Scans, finds, connects, but, after 8 WriteData btn presses, it stopped sending a

You can get Service and Characteristic IDs when you connect to the device and do a ReadData, but I think these are usually of readable characteristics rather than the writeable ones. User nRF Connect app (free ✌) to manually connect up to the device and explore what it offers. Pretty sure it will
link: I am going through the BLE 2 example. In order to send data to the remote BLE device (uBlox NINA), I must send: WriteData(Service As String, Character
link: What is the precise model number? Is it a GPS module that communicates over BLE, or just a BLE serial cable replacement (no GPS), like the HM-10 / HC

to write try some way like that WriteData("6e400001-b5a3-f393-e0a9-e50e24dcca9e", "6e400002-b5a3-f393-e0a9-e50e24dcca9e", Array As Byte(1))
link: The data sheet for the module I am trying to communicate with tells me the service UUID is :- 49535343-FE7D-4AE5-8FA9-9FAFD205E455 and the Character
link: Try the example first BLE 2 - Bluetooth Low Energy%27 https://www.b4x.com/android/forum/threads/b4x-ble-2-bluetooth-low-energy.59937/']Thread ' BLE 2

manager.WriteData(serveuuid,rxuuid, "your string here".GetBytes("utf8"))
link: How can I send a 5 character string to the remote device. The best I can come up with is below, which is painfully slow and clearly reveals my lack of
link: ??? It expects an array of bytes.
link: Sorry for the NRF & DFU acronyms. NRF is Nordic related BLE chipset (nrf51, nrf52), and DFU is the Device Firmware Update that Nordic provides. Atta

I don't know if this is true for all BLE devices, but for the two I just went through here: every WRITEable characteristic is also READable. = maybe characteristics can't be WRITE-only, always have to be readable too, in which case .ReadData is effectively listing all characteristics, and maybe tha
link: Hey, here's one: try doing a .ReadData on that service first, before the write. Perhaps that's when BLE2 or Android collates its list of characterist
link: Thank you Erel. Gotten past that using this Service UUID - there are 4 of them, tried them all... Dim Service As String Service = "00001800-00
link: Hello all, Can anyone tell me what this error means and how to fix it? Working with the BLEExample, slightly modified, I get the error below every t

********* Write data to your BLE Module********** Look this: manager.WriteData("service id", "char id", HMString.GetBytes("UTF8")) 'replace the ids in this link to send data to BLE modules https://www.b4x.com/android/forum/threads/ble-2-bluetooth-low-energy.59937/page-4#post-409128 In your code wri
link: I've always used the UUID strings returned by eg .Connected event. I see in your screenshot that they have lowercase letters, but in your code sample

Usage: CharacteristicUUID As String, Read As Boolean, Write As Boolean, Notify As Boolean. Example: CreateCharacteristicUUIDs("CharacteristicUUID,Read,Write,Notify", "CharacteristicUUID,Read,Write,Notify", ...) CreatePrimaryServiceUUID As String Create the primary service UUID. The primary service

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