Can't get characteristics list of a service

[surajit-bitcanny]

I want to get all characteristics list of a service. Every time I get empty characteristics array. I have used following ways to get characteristics list:

• `service.discoverCharacteristics(null, function(error, characteristics) {

        });`
  

• service.once('characteristicsDiscover', (characteristics)=>{ }); service.discoverCharacteristics();

Both of these approaches do not work.

[surajit-bitcanny]

It is solved by setting minSdkVersion to 21 for Android.

[nielsswinkels]

Cool that you found a solution! Here the solution was to search for specific characteristics by supplying the uuid.

[bitabs]

@nielsswinkels I'm having the same issue even though the minSdkVersion is set to 21.

I have it like this:

....
this._rfduinoService.once("characteristicsDiscover", (characteristics) => {
        console.log("here: ", characteristics);
        if (this.options.verbose) console.log('Discovered ' + characteristics.length + ' service characteristics');
        for (let i = 0; i < characteristics.length; i++) {
          // console.log(characteristics[i].uuid);
          if (characteristics[i].uuid === k.RFduinoUuidReceive || characteristics[i].uuid === rfduinoUuidReceiveLong) {
            if (this.options.verbose) console.log("Found receiveCharacteristicUUID");
            this._receiveCharacteristic = characteristics[i];
          }
          if (characteristics[i].uuid === k.RFduinoUuidSend || characteristics[i].uuid === rfduinoUuidSendLong) {
            if (this.options.verbose) console.log("Found sendCharacteristicUUID");
            this._sendCharacteristic = characteristics[i];
          }
        }
....

Where this._rfduinoService is:

@jacobrosenthal any ideas?