Thanks!
"Allow External Apps" is of course anabled. Also the other app (Tasker URL Launcher) was installed after Tasker.
Also, there exists a task called "@NfcTest".
And on the tag, there is the URL tasker://@NfcTest
This is the logcat from the point where I place the NFC tag on the phone and tap on the URL:
D/ALSADevice( 1132): route: devices 0x2 in mode 0
D/ALSADevice( 1132): No valid input device: 0
D/alsa_ucm( 1132): snd_use_case_set(): uc_mgr 0xb8a389b8 identifier _enadev value Speaker
D/ALSADevice( 1132): switchDevice: mCurTxUCMDevivce DMIC Endfire mCurRxDevDevice Speaker
I/ALSADevice( 1132): a2220: txDevice=(null) rxDevice=Speaker
D/alsa_ucm( 1132): snd_use_case_set(): uc_mgr 0xb8a389b8 identifier _verb value HiFi
D/alsa_ucm( 1132): Set mixer controls for Speaker enable 1
D/alsa_ucm( 1132): acdb_id 15 cap 1 enable 1
D/ACDB-LOADER( 1132): ACDB -> send_audio_cal, acdb_id = 15, path = 0
D/ACDB-LOADER( 1132): ACDB -> send_adm_topology
D/ACDB-LOADER( 1132): ACDB -> ACDB_CMD_GET_AUDPROC_COMMON_TOPOLOGY_ID
D/ACDB-LOADER( 1132): ACDB -> send_audtable
D/ACDB-LOADER( 1132): ACDB -> ACDB_CMD_GET_AUDPROC_COMMON_TABLE
D/ACDB-LOADER( 1132): ACDB -> AUDIO_SET_AUDPROC_CAL
D/ACDB-LOADER( 1132): ACDB -> send_audvoltable
D/ACDB-LOADER( 1132): ACDB -> ACDB_CMD_GET_AUDPROC_GAIN_DEP_VOLTBL_STEP_COPP
D/ACDB-LOADER( 1132): ACDB -> AUDIO_SET_AUDPROC_VOL_CAL
D/ACDB-LOADER( 1132): ACDB -> send_afe_cal
D/ACDB-LOADER( 1132): ACDB -> ACDB_CMD_GET_AFE_COMMON_TABLE
E/ACDB-LOADER( 1132): Error: ACDB AFE returned = -8
D/ACDB-LOADER( 1132): ACDB -> AUDIO_SET_AFE_CAL
D/alsa_ucm( 1132): Setting mixer control: PRI_RX Channels, value: Two
D/alsa_ucm( 1132): Setting mixer control: RX5 MIX1 INP1, value: RX1
D/alsa_ucm( 1132): Setting mixer control: RX5 MIX1 INP2, value: RX2
D/alsa_ucm( 1132): Setting mixer control: RX6 DSM MUX, value: DSM_INV
D/alsa_ucm( 1132): Setting mixer control: LINEOUT2 Volume, value: 100
D/alsa_ucm( 1132): Setting mixer control: LINEOUT4 Volume, value: 100
D/alsa_ucm( 1132): Setting mixer control: RX5 Digital Volume, value: 65
D/alsa_ucm( 1132): Set mixer controls for HiFi enable 1
D/alsa_ucm( 1132): Setting mixer control: PRI_RX Audio Mixer MultiMedia1, value: 1
D/ALSADevice( 1132): close: handle 0xb8a8b2a8 h 0x0
D/ALSADevice( 1132): open: handle 0xb8a8b2a8, format 0x2
D/ALSADevice( 1132): Device value returned is hw:0,0
D/ALSADevice( 1132): handle->format: 0x2
D/ALSADevice( 1132): setHardwareParams: reqBuffSize 2048 channels 2 sampleRate 48000
D/ALSADevice( 1132): setHardwareParams: buffer_size 16384, period_size 2048, period_cnt 8
D/NfcDispatcher(16986): dispatch tag: TAG: Tech [android.nfc.tech.IsoDep, android.nfc.tech.NfcA, android.nfc.tech.Ndef] message: NdefMessage [NdefRecord tnf=1 type=55 payload=007461736B65723A2F2F404E666354657374]
D/NfcHandover(16986): tryHandover(): NdefMessage [NdefRecord tnf=1 type=55 payload=007461736B65723A2F2F404E666354657374]
I/ActivityManager(16694): START u0 {flg=0x10008000 cmp=com.android.nfc/.NfcRootActivity (has extras)} from pid 16986
I/NfcDispatcher(16986): matched multiple TECH
I/ActivityManager(16694): START u0 {cmp=com.android.nfc/.TechListChooserActivity (has extras)} from pid 16986
I/ActivityManager(16694): Displayed com.android.nfc/.TechListChooserActivity: +216ms (total +239ms)
E/MP-Decision( 1042): UP Ld:82 Nw:1.990000 Tw:140 rq:2.900000 seq:147.000000
E/MP-Decision( 1042): DOWN Ld:42 Ns:1.100000 Ts:190 rq:0.000000 seq:206.000000
D/NativeNfcTag(16986): Tag lost, restarting polling loop
E/Sensors (16694): accelHandler 0.467029 4.615202 8.216114
I/ActivityManager(16694): START u0 {act=android.nfc.action.TECH_DISCOVERED flg=0x3000000 cmp=com.android.apps.tag/.TagViewer (has extras)} from pid 16986
E/MP-Decision( 1042): UP Ld:65 Nw:1.990000 Tw:140 rq:4.500000 seq:147.000000
I/ActivityManager(16694): Displayed com.android.apps.tag/.TagViewer: +125ms
E/MP-Decision( 1042): DOWN Ld:31 Ns:1.100000 Ts:190 rq:0.000000 seq:256.000000
I/ActivityManager(16694): START u0 {act=android.intent.action.VIEW dat=tasker://@NfcTest cmp=com.aledthomas.taskerurllauncher/.main} from pid 22319
E/MP-Decision( 1042): UP Ld:62 Nw:1.990000 Tw:140 rq:4.400000 seq:146.000000
E/Tasker (17576): 14.37.12#BroadcastDecode: error: no valid actions found
E/Sensors (16694): accelHandler -0.825084 4.476292 8.068821
D/dalvikvm(22319): JIT code cache reset in 0 ms (4096 bytes 2/0)
E/MP-Decision( 1042): DOWN Ld:3 Ns:1.100000 Ts:190 rq:0.000000 seq:208.000000
D/ALSADevice( 1132): standby: handle 0xb8a8b2a8 h 0x0
D/alsa_ucm( 1132): snd_use_case_set(): uc_mgr 0xb8a389b8 identifier _verb value Inactive
D/alsa_ucm( 1132): Set mixer controls for HiFi enable 0
D/alsa_ucm( 1132): Setting mixer control: PRI_RX Audio Mixer MultiMedia1, value: 0
D/alsa_ucm( 1132): snd_use_case_set(): uc_mgr 0xb8a389b8 identifier _disdev value DMIC Endfire
D/alsa_ucm( 1132): disdev: device DMIC Endfire not enabled, no need to disable
D/alsa_ucm( 1132): snd_use_case_set(): uc_mgr 0xb8a389b8 identifier _disdev value Speaker
D/alsa_ucm( 1132): Set mixer controls for Speaker enable 0
D/alsa_ucm( 1132): Setting mixer control: RX5 MIX1 INP1, value: ZERO
D/alsa_ucm( 1132): Setting mixer control: RX5 MIX1 INP2, value: ZERO
D/alsa_ucm( 1132): Setting mixer control: LINEOUT2 Volume, value: 0
D/alsa_ucm( 1132): Setting mixer control: LINEOUT4 Volume, value: 0
D/alsa_ucm( 1132): Setting mixer control: RX5 Digital Volume, value: 0
D/AudioUsbALSA( 1132): exitPlaybackThread, mproxypfdPlayback: -1
D/AudioUsbALSA( 1132): closeDevice handle 0x0
D/AudioUsbALSA( 1132): closeDevice handle 0x0
E/Sensors (16694): accelHandler -0.482596 4.097878 8.212522
E/Sensors (16694): accelHandler -0.391586 4.093088 8.319100
This suggests that there is no task @NfcTest? But, as I said, there definitely is ...
Thanks
Niki