React-native-ble-plx: nothing returned from device.discoverAllServicesAndCharacteristics()

[JordanKlaers]

I have a raspBerry Pi zero W running node with bleno.
I have a service for writing to the PI.
I used lightblue to connect to the pi over bluetooth and write hex values which I am able to see logging from the pi. (<< just to confirm the pi is working as expected)

So I am sure I have a service working but when I call device.discoverAllServicesAndCharacteristics()
from the "Connecting and discovering services and characteristics" section in the documents, the device object, when I console.log from the second .then() looks like --
id:"B8:27:EB:E4:EF:C5"
isConnectable:null
localName:null
manufacturerData:null
name:"raspberrypi"
overflowServiceUUIDs:null
rssi:null
serviceData:null
serviceUUIDs:null
solicitedServiceUUIDs:null
txPowerLevel:null

to me it seems there are no services coming from the device? what might I be doing incorrectly?
I have also confirmed the deviced id matches that coming from the pi.

the code im having issues with is -
`

scanAndConnect() {
this.manager.startDeviceScan(null, null, (error, device) => {
if (error) {
// Handle error (scanning will be stopped automatically)
return
}
// Check if it is a device you are looking for based on advertisement data
// or other criteria.
if (device.name === 'raspberrypi') {
this.manager.stopDeviceScan();
device.connect()
.then((device) => {
return device.discoverAllServicesAndCharacteristics(device.id)
})
.then((device) => {
console.log("device connected!");
console.log(device); // <--------- this is the console.log() I am referring to
// Do work on device with services and characteristics
})
.catch((error) => {
// Handle errors
console.log(error);
});
}
});
}
`

[Cierpliwy]

There is services() function which returns Array of currently discovered services.

[JordanKlaers]

Thank you, I was able to get the services and eventually characteristics and I can write to the device. I noticed you cant send large amount of data in a single call. When i try to send the string "Hello world how long can this be?" the other end only received "hello world how long". I am curious if there is someway to send more data or do I need to make multiple calls if I want more data sent?

[Cierpliwy]

That's basically it. Both devices negotiate MTU which is used for further transmission. Minimum value is 23, so with 3 bytes ATT header you can send 20 bytes. iOS by default negotiates MTU of size 158 and on Android you can call device.requestMTU(your_value) to try get bigger payload per package.

[pstanton]

i can't find device.getServices() but device.services() .. i assume that's what you mean?

[Cierpliwy]

Fixed previous comment to not mislead anybody.