Add support for Mercedes Benz Sprinter TPMS sensor (#3553)

* Add support for Mercedes Benz Sprinter TPMS sensor

* fix: stabilize Sprinter TPMS decoding (#3595)

Co-authored-by: RomeoApps <294788459+RomeoApps@users.noreply.github.com>

---------

Co-authored-by: RomeoApps <romeo@romeoapps.com>
Co-authored-by: RomeoApps <294788459+RomeoApps@users.noreply.github.com>

README.md

@@ -452,6 +452,7 @@ See [CONTRIBUTING.md](./docs/CONTRIBUTING.md).
     [362]  Jansite TPMS TY588-EU2
     [363]  Oregon Scientific WMR500 weather station
     [364]  Elsner Solexa 230V
+    [365]  Mercedes Benz Sprinter 4500 TPMS sensor
 
 * Disabled by default, use -R n or a conf file to enable
 

conf/rtl_433.example.conf

@@ -604,6 +604,7 @@ convert si
   protocol 362 # Jansite TPMS TY588-EU2
   protocol 363 # Oregon Scientific WMR500 weather station
   protocol 364 # Elsner Solexa 230V
+  protocol 365 # Mercedes Benz Sprinter 4500 TPMS sensor
 
 ## Flex devices (command line option "-X")
 

include/rtl_433_devices.h

@@ -372,6 +372,7 @@
     DECL(tpms_jansite_ty588) \
     DECL(oregon_scientific_wmr500) \
     DECL(elsner_solexa) \
+    DECL(tpms_mercedes_benz) \
     /* Add new decoders here. */
 
 #define DECL(name) extern r_device const name;

src/CMakeLists.txt

@@ -329,6 +329,7 @@ add_library(r_433 STATIC
     devices/tpms_jansite_ty468.c
     devices/tpms_jansite_ty588.c
     devices/tpms_kia.c
+    devices/tpms_mercedes_benz.c
     devices/tpms_nissan.c
     devices/tpms_pmv107j.c
     devices/tpms_porsche.c

src/devices/tpms_mercedes_benz.c

@@ -0,0 +1,120 @@
+/** @file
+    Mercedes Benz Sprinter TPMS data.
+
+    Copyright (C) 2026 Bruno OCTAU (ProfBoc75)
+
+    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.
+*/
+/**
+Mercedes Benz Sprinter TPMS data.
+
+issue #3539:
+- 2025 Mercedes Benz Sprinter 4500 TPMS sensor
+- Signal is FSK MC and pulse width 25us.
+- Preamble {12} 0x002 or 0xff2
+
+Data Layout:
+
+    Preamble    Byte  0  1  2  3  4  5  6  7  8  9
+    002 or ff2        ST II II II II PP TT CC FF XX
+
+- ST:  {8} Family/state byte, observed as 0x83 while stationary and 0xa3 while
+           moving. These capture-derived values are not known to be exhaustive.
+- II: {32} ID / Serial number
+- PP:  {8} Pressure, PSI, scale 2.75
+- TT:  {8} Temperature, C, offset 51
+- CC:  {8} Counter, increase by 1 each message
+- FF:  {8} Status, observed as 0x6b, 0xe9, or 0xea
+- XX:  {8} CRC-8 of the previous 9 bytes, poly 0x2f, init 0xaa, final XOR 0x00
+
+*/
+
+#include "decoder.h"
+
+static int tpms_mercedes_benz_decode(r_device *decoder, bitbuffer_t *bitbuffer)
+{
+    uint8_t const preamble[] = {0x00,0x20}; // 12 bit , 0x002
+    uint8_t b[10];
+
+    if (bitbuffer->num_rows != 1) {
+        decoder_logf(decoder, 2, __func__, "row error");
+        return DECODE_ABORT_EARLY;
+    }
+
+    int pos = bitbuffer_search(bitbuffer, 0, 0, preamble, 12);
+    if (pos >= bitbuffer->bits_per_row[0]) {
+        decoder_logf(decoder, 2, __func__, "Preamble 0x002 not found");
+        return DECODE_ABORT_EARLY;
+    }
+
+    if (bitbuffer->bits_per_row[0] < 80) {
+        decoder_logf(decoder, 1, __func__, "Too short");
+        return DECODE_ABORT_LENGTH;
+    }
+
+    pos += 12;
+    bitbuffer_extract_bytes(bitbuffer, 0, pos, b, 80);
+
+    decoder_log_bitrow(decoder, 2, __func__, b, 80, "MSG");
+
+    if (crc8(b, 10, 0x2f, 0xaa)) {
+        decoder_logf(decoder, 1, __func__, "crc error, expected %02x, calculated %02x", b[9], crc8(b, 9, 0x2f, 0xaa));
+        return DECODE_FAIL_MIC; // crc mismatch
+    }
+
+    if (b[0] != 0x83 && b[0] != 0xa3) {
+        decoder_logf(decoder, 1, __func__, "unexpected family/state byte %02x", b[0]);
+        return DECODE_FAIL_SANITY;
+    }
+
+    char id_str[4 * 2 + 1];
+    snprintf(id_str, sizeof(id_str), "%02x%02x%02x%02x", b[1], b[2], b[3], b[4]);
+    float pressure_PSI = b[5] / 2.75f;
+    int temperature_C  = b[6] - 51;
+    int counter        = b[7] & 0x1f;
+    int flags1         = b[7] >> 5;
+    int flags2         = b[8];
+
+    /* clang-format off */
+    data_t *data = data_make(
+            "model",           "",            DATA_STRING, "MercedesBenz-Sprinter",
+            "type",            "",            DATA_STRING, "TPMS",
+            "id",              "",            DATA_STRING, id_str,
+            "pressure_PSI",    "Pressure",    DATA_FORMAT, "%.1f PSI", DATA_DOUBLE, (double)pressure_PSI,
+            "temperature_C",   "Temperature", DATA_FORMAT, "%.1f C",   DATA_DOUBLE, (double)temperature_C,
+            "counter",         "Counter",     DATA_INT,    counter,
+            "flags1",          "Flags 1",     DATA_FORMAT, "0b%03b",     DATA_INT,    flags1,
+            "flags2",          "Flags 2",     DATA_INT,    flags2,
+            "mic",             "Integrity",   DATA_STRING, "CRC",
+            NULL);
+    /* clang-format on */
+
+    decoder_output_data(decoder, data);
+    return 1;
+}
+
+static char const *const output_fields[] = {
+        "model",
+        "type",
+        "id",
+        "pressure_PSI",
+        "temperature_C",
+        "counter",
+        "flags1",
+        "flags2",
+        "mic",
+        NULL,
+};
+
+r_device const tpms_mercedes_benz = {
+        .name        = "Mercedes Benz Sprinter 4500 TPMS sensor",
+        .modulation  = FSK_PULSE_MANCHESTER_ZEROBIT,
+        .short_width = 25,
+        .long_width  = 25,
+        .reset_limit = 2000,
+        .decode_fn   = &tpms_mercedes_benz_decode,
+        .fields      = output_fields,
+};