diff --git a/pySim/cat.py b/pySim/cat.py
index d2a3a66a..73f0a762 100644
--- a/pySim/cat.py
+++ b/pySim/cat.py
@@ -267,6 +267,9 @@ class SsString(COMPR_TLV_IE, tag=0x89):
 
 # TS 102 223 Section 8.15
 class TextString(COMPR_TLV_IE, tag=0x8D):
+    _test_de_encode = [
+        ( '8d090470617373776f7264', {'dcs': 4, 'text_string': '70617373776f7264'} ),
+    ]
     _construct = Struct('dcs'/Int8ub, # TS 03.38
                         'text_string'/HexAdapter(GreedyBytes))
 
@@ -444,6 +447,9 @@ class BrowserTerminationCause(COMPR_TLV_IE, tag=0xB4):
 
 # TS 102 223 Section 8.52
 class BearerDescription(COMPR_TLV_IE, tag=0xB5):
+    _test_de_encode = [
+        ( 'b50103', {'bearer_parameters': '', 'bearer_type': 'default'} ),
+    ]
     # TS 31.111 Section 8.52.1
     BearerParsCs = Struct('data_rate'/Int8ub,
                           'bearer_service'/Int8ub,
@@ -507,11 +513,17 @@ class ChannelStatus(COMPR_TLV_IE, tag = 0xB8):
 
 # TS 102 223 Section 8.58
 class OtherAddress(COMPR_TLV_IE, tag = 0xBE):
+    _test_de_encode = [
+        ( 'be052101020304', {'address': '01020304', 'type_of_address': 'ipv4'} ),
+    ]
     _construct = Struct('type_of_address'/Enum(Int8ub, ipv4=0x21, ipv6=0x57),
                         'address'/HexAdapter(GreedyBytes))
 
 # TS 102 223 Section 8.59
 class UiccTransportLevel(COMPR_TLV_IE, tag = 0xBC):
+    _test_de_encode = [
+        ( 'bc03028000', {'port_number': 32768, 'protocol_type': 'tcp_uicc_client_remote'} ),
+    ]
     _construct = Struct('protocol_type'/Enum(Int8ub, udp_uicc_client_remote=1, tcp_uicc_client_remote=2,
                                              tcp_uicc_server=3, udp_uicc_client_local=4,
                                              tcp_uicc_client_local=5, direct_channel=6),
@@ -558,6 +570,9 @@ class RemoteEntityAddress(COMPR_TLV_IE, tag=0xC9):
 
 # TS 102 223 Section 8.70
 class NetworkAccessName(COMPR_TLV_IE, tag=0xC7):
+    _test_de_encode = [
+        ( 'c704036e6161', '036e6161' ),
+    ]
     _construct = HexAdapter(GreedyBytes)
 
 # TS 102 223 Section 8.72
diff --git a/pySim/global_platform/http.py b/pySim/global_platform/http.py
new file mode 100644
index 00000000..f0e98aa0
--- /dev/null
+++ b/pySim/global_platform/http.py
@@ -0,0 +1,93 @@
+"""GlobalPlatform Remote Application Management over HTTP Card Specification v2.3 - Amendment B.
+Also known as SCP81 for SIM/USIM/UICC/eUICC/eSIM OTA.
+"""
+
+# (C) 2024 by Harald Welte <laforge@osmocom.org>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from construct import Struct, Int8ub, Int16ub, Bytes, GreedyBytes, GreedyString, BytesInteger
+from construct import this, len_, Rebuild, Const
+from construct import Optional as COptional
+
+from pySim.tlv import BER_TLV_IE
+from pySim import cat
+
+
+# Table 3-3 + Section 3.8.1
+class RasConnectionParams(BER_TLV_IE, tag=0x84, nested=cat.OpenChannel.nested_collection_cls.possible_nested):
+    pass
+
+# Table 3-3 + Section 3.8.2
+class SecurityParams(BER_TLV_IE, tag=0x85):
+    _test_de_encode = [
+        ( '850804deadbeef020040', {'kid': 64,'kvn': 0, 'psk_id': b'\xde\xad\xbe\xef', 'sha_type': None} )
+    ]
+    _construct = Struct('_psk_id_len'/Rebuild(Int8ub, len_(this.psk_id)), 'psk_id'/Bytes(this._psk_id_len),
+                        '_kid_kvn_len'/Const(2, Int8ub), 'kvn'/Int8ub, 'kid'/Int8ub,
+                        'sha_type'/COptional(Int8ub))
+
+# Table 3-3 + ?
+class ExtendedSecurityParams(BER_TLV_IE, tag=0xA5):
+    _construct = GreedyBytes
+
+# Table 3-3 + Section 3.8.3
+class SessionRetryPolicyParams(BER_TLV_IE, tag=0x86):
+    _construct = Struct('retry_counter'/Int16ub,
+                        'retry_waiting_delay'/BytesInteger(5),
+                        'retry_report_failure'/COptional(GreedyBytes))
+
+# Table 3-3 + Section 3.8.4
+class AdminHostParam(BER_TLV_IE, tag=0x8A):
+    _test_de_encode = [
+        ( '8a0a61646d696e2e686f7374', 'admin.host' ),
+    ]
+    _construct = GreedyString('utf-8')
+
+# Table 3-3 + Section 3.8.5
+class AgentIdParam(BER_TLV_IE, tag=0x8B):
+    _construct = GreedyString('utf-8')
+
+# Table 3-3 + Section 3.8.6
+class AdminUriParam(BER_TLV_IE, tag=0x8C):
+    _test_de_encode = [
+        ( '8c1668747470733a2f2f61646d696e2e686f73742f757269', 'https://admin.host/uri' ),
+    ]
+    _construct = GreedyString('utf-8')
+
+# Table 3-3
+class HttpPostParams(BER_TLV_IE, tag=0x89, nested=[AdminHostParam, AgentIdParam, AdminUriParam]):
+    pass
+
+# Table 3-3
+class AdmSessionParams(BER_TLV_IE, tag=0x83, nested=[RasConnectionParams, SecurityParams,
+                                                     ExtendedSecurityParams, SessionRetryPolicyParams,
+                                                     HttpPostParams]):
+    pass
+
+# Table 3-3 + Section 3.11.4
+class RasFqdn(BER_TLV_IE, tag=0xD6):
+    _construct = GreedyBytes # FIXME: DNS String
+
+# Table 3-3 + Section 3.11.7
+class DnsConnectionParams(BER_TLV_IE, tag=0xFA, nested=cat.OpenChannel.nested_collection_cls.possible_nested):
+    pass
+
+# Table 3-3
+class DnsResolutionParams(BER_TLV_IE, tag=0xB3, nested=[RasFqdn, DnsConnectionParams]):
+    pass
+
+# Table 3-3
+class AdmSessTriggerParams(BER_TLV_IE, tag=0x81, nested=[AdmSessionParams, DnsResolutionParams]):
+    pass
diff --git a/tests/test_tlvs.py b/tests/test_tlvs.py
index a0dd1076..429b9669 100755
--- a/tests/test_tlvs.py
+++ b/tests/test_tlvs.py
@@ -31,6 +31,7 @@ import pySim.sysmocom_sja2
 import pySim.gsm_r
 import pySim.cdma_ruim
 import pySim.global_platform
+import pySim.global_platform.http
 
 if 'unittest.util' in __import__('sys').modules:
     # Show full diff in self.assertEqual.