SS1 encrypting only from server side

Hi,
I'm trying to get SS1 working and I have a few issues with it.

Mainly messages are only encrypted from server side and not from client side:

Standard: DLMS
Security: ENCRYPTION
System title: 56 55 54 36 31 38 35 30
Authentication key: 56 55 54 42 52 41 75 74 68 4B 6F 68 6F 75 74 31
Block cipher key 41 42 43 44 31 32 33 34 56 55 54 42 52 31 32 33
TX: 00 01 00 12 43 FC 00 53 60 51 A1 09 06 07 60 85 74 05 08 01 03 A6 0A 04 08 56 55 54 36 31 38 35 30 8A 02 07 80 8B 07 60 85 74 05 08 02 02 AC 12 80 10 04 43 42 2C 30 66 26 48 67 2E 20 70 4E 6B 04 4D BE 17 04 15 21 13 21 00 00 00 00 01 98 EE D1 DC CF 42 5F 8E 9B 47 75 7B 7E
RX: 00 01 43 FC 00 12 00 5F 61 5D A1 09 06 07 60 85 74 05 08 01 03 A2 03 02 01 00 A3 05 A1 03 02 01 0E A4 0A 04 08 41 42 43 44 45 46 47 48 88 02 07 80 89 07 60 85 74 05 08 02 02 AA 12 80 10 24 78 41 2E 3A 62 1F 74 4A 6F 00 11 21 6A 6C 59 BE 17 04 15 28 13 21 00 00 00 00 5E 7A C4 77 8D 74 C6 1C 0B 89 3D 2A D3 42
TX: 00 01 00 12 43 FC 00 26 CB 24 21 00 00 00 00 C3 99 2F D1 D5 90 5D 73 8E 64 47 8B 85 88 DC BE 6E 1D 8C AD D4 B5 FF 1F 4B 99 0C 09 57 FC 77
RX: 00 01 43 FC 00 12 00 1F CF 1D 21 00 00 00 01 03 D8 02 1B 29 63 DB 0B AA 02 27 07 57 39 9D E9 D5 D0 0C B0 49 C3 C0 BB

INFO: -------- Reading (HLS + SS1 E diffe) 1.0.1.8.0.255 ---------------

TX: 00 01 00 12 43 FC 00 0D C0 01 C1 00 03 01 00 01 08 00 FF 01 00
RX: 00 01 43 FC 00 12 00 1C DB 08 41 42 43 44 45 46 47 48 11 21 00 00 00 02 E0 81 CD 2A C9 66 5C E0 9F 58 F3 2A

TX: 00 01 00 12 43 FC 00 0D C0 01 C1 00 03 01 00 01 08 00 FF 03 00
RX: 00 01 43 FC 00 12 00 1A DB 08 41 42 43 44 45 46 47 48 0F 21 00 00 00 03 75 28 77 85 12 9F 76 29 C0 C9

TX: 00 01 00 12 43 FC 00 0D C0 01 C1 00 03 01 00 01 08 00 FF 02 00
RX: 00 01 43 FC 00 12 00 17 DB 08 41 42 43 44 45 46 47 48 0C 21 00 00 00 04 AC 55 E9 10 85 7B 3E

WARNING: DisconnectRequest (HLS + SS1 E diffie)
TX: 00 01 00 12 43 FC 00 05 62 03 80 01 00
RX: 00 01 43 FC 00 12 00 1E 63 18 80 01 00 BE 16 04 15 28 13 21 00 00 00 05 47 2B 8E F0 09 1F 03 11 80 A0 67 7A D9 EC

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Then I was debugging it a little bit in GXDLMS class, and I noticed if statement regarding GBT in conformance. When I removed GBT from conformance, it started encrypting even from client side, but this error appeared:

TX:00 01 00 12 43 FC 00 53 60 51 A1 09 06 07 60 85 74 05 08 01 03 A6 0A 04 08 56 55 54 36 31 38 35 30 8A 02 07 80 8B 07 60 85 74 05 08 02 02 AC 12 80 10 1D 3F 11 34 4C 47 22 0F 40 1B 19 47 63 19 24 71 BE 17 04 15 21 13 21 00 00 00 00 01 98 EE D1 DC CF 42 5F 8E BB 47 75 7B 7E
RX:00 01 43 FC 00 12 00 5F 61 5D A1 09 06 07 60 85 74 05 08 01 03 A2 03 02 01 00 A3 05 A1 03 02 01 0E A4 0A 04 08 41 42 43 44 45 46 47 48 88 02 07 80 89 07 60 85 74 05 08 02 02 AA 12 80 10 39 3B 16 26 72 0F 2B 5D 07 0D 4A 4A 62 63 1A 77 BE 17 04 15 28 13 21 00 00 00 00 5E 7A C4 77 8D 74 C6 3C 0B 89 3D 2A D3 42
TX:00 01 00 12 43 FC 00 26 CB 24 21 00 00 00 00 C3 99 2F D1 D5 90 5D 73 8E 64 47 8B 85 88 DC A8 88 1E 5A 36 E9 CB AF 6E 1D 06 17 9C AC 80 11
RX:00 01 43 FC 00 12 00 1F CF 1D 21 00 00 00 01 03 D8 02 1B 29 63 DB 0B F9 F8 3D 2E 42 02 19 9F D7 96 EF 10 15 B5 53 FC

TX:1.0.1.8.0.255:1
TX:00 01 00 12 43 FC 00 B7 DD 08 00 00 00 00 00 00 00 01 08 56 55 54 36 31 38 35 30 08 41 42 43 44 45 46 47 48 00 00 01 02 01 01 81 80 0C E0 19 73 D0 98 BE 0D D1 91 35 24 D5 B3 45 89 8E B6 D9 5C E1 AC 56 07 D3 C8 79 D9 91 06 04 DE 61 14 94 A0 38 09 C8 C4 B0 49 60 D4 46 19 52 F2 27 4E 4F CE 00 44 26 CD 29 26 DC 52 04 74 9B 24 AE 01 BF D3 05 1E D3 15 FA E2 CD B5 C9 32 6B CC A9 16 A5 D8 E8 30 01 00 91 02 2B 53 26 40 D8 E3 26 D3 13 90 34 66 42 5B B5 6C B1 73 CD 32 87 3E BC B7 63 DD AA 79 24 CA F8 B8 EB 5B 40 19 C7 66 12 21 00 00 00 00 D7 54 30 AF 3B EF 65 67 2C DF DC 66 6F
RX:ERR:00 01 43 FC 00 12 00 BA DD 08 00 00 00 00 00 00 00 02 08 41 42 43 44 45 46 47 48 08 56 55 54 36 31 38 35 30 00 00 01 02 01 01 81 80 33 01 85 31 89 F0 E4 26 F6 44 2C D1 70 DF EB 91 7C C8 B8 FF 39 08 E7 15 01 39 11 15 D5 3C 90 00 1C E4 43 01 D5 B5 E2 EE 4C BB 4C 79 B1 51 FF 76 9B 6F E6 F7 BA 7B C6 9D 4C 6D 1E 63 63 2A 21 7A D4 FA DF 33 43 80 26 FA 67 84 BA 1D 42 A9 55 D8 F1 16 14 86 34 EE 66 98 FB 4C 82 DD 2F 62 2A 91 CC AA 98 32 5C 63 85 37 34 F9 1D 6D 7F AF 37 B3 38 85 0C CF EF D0 78 A0 2E D2 79 67 9E A8 9F A4 15 31 00 00 00 00 D5 C7 33 42 0C 75 EB FD 36 5C EC 50 EC DC E4 2B

javax.crypto.AEADBadTagException: Tag mismatch!
java.base/com.sun.crypto.provider.GaloisCounterMode.decryptFinal(GaloisCounterMode.java:623)
java.base/com.sun.crypto.provider.CipherCore.finalNoPadding(CipherCore.java:1116)
java.base/com.sun.crypto.provider.CipherCore.fillOutputBuffer(CipherCore.java:1053)
java.base/com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:853)
java.base/com.sun.crypto.provider.AESCipher.engineDoFinal(AESCipher.java:446)
java.base/javax.crypto.Cipher.doFinal(Cipher.java:2202)
gurux.dlms.secure.GXSecure.encryptAesGcm(GXSecure.java:675)
gurux.dlms.secure.GXSecure.decryptAesGcm(GXSecure.java:1028)
gurux.dlms.secure.GXCiphering.decrypt(GXCiphering.java:147)
gurux.dlms.GXDLMS.handleGeneralCiphering(GXDLMS.java:3953)
gurux.dlms.GXDLMS.getPdu(GXDLMS.java:3692)
gurux.dlms.GXDLMS.getData(GXDLMS.java:4112)
gurux.dlms.GXDLMSClient.getData(GXDLMSClient.java:2452)
client.reader.MyReader.myReadDLMSPacket(MyReader.java:320)