diff --git a/README.md b/README.md
index 0b91a0ce..64f49246 100644
--- a/README.md
+++ b/README.md
@@ -336,6 +336,7 @@ See [CONTRIBUTING.md](./docs/CONTRIBUTING.md).
[248]* Nissan TPMS
[249] Bresser lightning
[250] Schou 72543 Day Rain Gauge, Motonet MTX Rain, MarQuant Rain Gauge
+ [251] Fine Offset / Ecowitt WH55 water leak sensor
* Disabled by default, use -R n or a conf file to enable
diff --git a/conf/rtl_433.example.conf b/conf/rtl_433.example.conf
index 098caa35..5f8a67c8 100644
--- a/conf/rtl_433.example.conf
+++ b/conf/rtl_433.example.conf
@@ -441,7 +441,7 @@ convert si
protocol 212 # Renault 0435R TPMS
protocol 213 # Fine Offset Electronics WS80 weather station
protocol 214 # EMOS E6016 weatherstation with DCF77
- protocol 215 # Emax W6, rebrand Altronics x7063/4, Optex 990040/50/51, Orium 13093/13123, Infactory FWS-1200, Newentor Q9, Otio 810025, Protmex PT3390A, Jula Marquant 014331/32, Weather Station or temperature/humidity sensor
+ protocol 215 # Emax W6, rebrand Altronics x7063/4, Optex 990040/50/51, Orium 13093/13123, Infactory FWS-1200, Newentor Q9, Otio 810025, Protmex PT3390A, Jula Marquant 014331/32, TechniSat IMETEO X6 76-4924-00, Weather Station or temperature/humidity sensor
# protocol 216 # ANT and ANT+ devices
protocol 217 # EMOS E6016 rain gauge
protocol 218 # Microchip HCS200/HCS300 KeeLoq Hopping Encoder based remotes (FSK)
@@ -477,6 +477,7 @@ convert si
# protocol 248 # Nissan TPMS
protocol 249 # Bresser lightning
protocol 250 # Schou 72543 Day Rain Gauge, Motonet MTX Rain, MarQuant Rain Gauge
+ protocol 251 # Fine Offset / Ecowitt WH55 water leak sensor
## Flex devices (command line option "-X")
diff --git a/include/rtl_433_devices.h b/include/rtl_433_devices.h
index 0fd12552..3561c4d7 100644
--- a/include/rtl_433_devices.h
+++ b/include/rtl_433_devices.h
@@ -258,6 +258,7 @@
DECL(tpms_nissan) \
DECL(bresser_lightning) \
DECL(schou_72543_rain) \
+ DECL(fineoffset_wh55) \
/* Add new decoders here. */
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index dde1f903..55c4469a 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -110,6 +110,7 @@ add_library(r_433 STATIC
devices/fineoffset_wh1080.c
devices/fineoffset_wh31l.c
devices/fineoffset_wh45.c
+ devices/fineoffset_wh55.c
devices/fineoffset_wn34.c
devices/fineoffset_ws80.c
devices/fineoffset_ws90.c
diff --git a/src/devices/fineoffset_wh1050.c b/src/devices/fineoffset_wh1050.c
index d740207c..64c06155 100644
--- a/src/devices/fineoffset_wh1050.c
+++ b/src/devices/fineoffset_wh1050.c
@@ -49,6 +49,8 @@ weather data as usual.
TFA 30.3151 Sensor is FSK version and decodes here. See issue #2538: Preamble is aaaa2dd4 and Temperature is not offset and rain gauge is 0.5 mm by pulse.
+Note there is a collison with WH55 which starts with `aa aa aa 2d d4 55`
+
To recognize which message is received (weather or time) you can use the 'msg_type' field on json output:
- msg_type 5 = weather data
- msg_type 6 = time data
@@ -270,5 +272,6 @@ r_device const tfa_303151 = {
.long_width = 60,
.reset_limit = 2500,
.decode_fn = &fineoffset_wh1050_callback,
+ .priority = 10, // Eliminate false positives by letting Fineoffset/Ecowitt WH55 go earlier
.fields = output_fields,
};
diff --git a/src/devices/fineoffset_wh55.c b/src/devices/fineoffset_wh55.c
new file mode 100644
index 00000000..0f92bb05
--- /dev/null
+++ b/src/devices/fineoffset_wh55.c
@@ -0,0 +1,119 @@
+/** @file
+ Fine Offset / Ecowitt WH55 water leak sensor.
+
+ Copyright (C) 2023 Christian W. Zuckschwerdt <zany@triq.net>
+ Protocol analysis by @cdavis289, test data by @AhrBee
+
+ 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.
+ */
+
+#include "decoder.h"
+
+/**
+Fine Offset / Ecowitt WH55 water leak sensor.
+
+Test decoding with: rtl_433 -f 433.92M -X 'n=wh55,m=FSK_PCM,s=60,l=60,g=1000,r=2500'
+
+Note there is a collison with Fine Offset WH1050 / TFA 30.3151 weather station which starts with `aa aa aa 2d d4 5`
+
+Data format:
+
+ 00 01 02 03 04 05 06 07 08 09 10 11
+ aa aa aa 2d d4 55 30 cf 55 04 02 89 be ae a4 20 10
+ MM FI II II BB VV VV AD XX ?? ?? ??
+
+- Preamble: aa aa aa
+- Sync: 2d d4
+- M: 8 bit Family code 0x55 (ECOWITT/FineOffset WH55)
+- F: 4 bit Flags, Channel (1 byte): (0=CH1, 1 = CH2, 2 = CH3, 3 = CH4)
+- I: 20 bit ID, shown with leading channel in Ecowitt Web App
+- B: 8 bit Battery (1 byte): 0x01 = 20%, 0x02 = 40%, 0x03 = 60%, 0x04 = 80%, 0x05 = 100%
+- V: 16 bit Raw sensor measurement
+- A: 2 bit Sensitivity and Alarm Setting: Left bit, 1 = High Sensitivity, 0 = Low Sensitivity, Right Bit: 1 = Alarm On, 0 = Alarm Off
+- D: 6 bit Unknown?
+- X: 8 bit CRC poly 0x31, init 0
+- ?: 24 bit Unknown?
+
+Format string:
+
+ TYPE:8h FLAGS?2b CH:2d ID:20h BATT:8d RAW:16h SENS:b ALARM:b ?:6b CRC:8h ?:hh hh hh
+
+*/
+
+static int fineoffset_wh55_decode(r_device *decoder, bitbuffer_t *bitbuffer)
+{
+ uint8_t const preamble[] = {0xAA, 0x2D, 0xD4, 0x55}; // part of preamble, sync word, and message type
+
+ if (bitbuffer->num_rows != 1) {
+ return DECODE_ABORT_EARLY; // We expect a single row
+ }
+
+ unsigned bitpos = bitbuffer_search(bitbuffer, 0, 0, preamble, 32);
+ bitpos += 24; // Start at message type
+ if (bitpos + 9 * 8 > bitbuffer->bits_per_row[0]) {
+ return DECODE_ABORT_EARLY; // No full message found
+ }
+
+ uint8_t b[12];
+ bitbuffer_extract_bytes(bitbuffer, 0, bitpos, b, 12 * 8);
+
+ if (crc8(b, 9, 0x31, 0x00)) {
+ return 0; // DECODE_FAIL_MIC;
+ }
+
+ decoder_log_bitrow(decoder, 1, __func__, b, 12*8, "Message data");
+
+ // GETTING MESSAGE TYPE
+ // int msg_type = b[0];
+ // int flags = (b[1] & 0xf);
+ int channel = (b[1] >> 4) + 1;
+ int device_id = (b[2] << 8) | b[3];
+ float battery = b[4] * 0.2f; // 0x01 = 20%, 0x02 = 40%, 0x03 = 60%, 0x04 = 80%, 0x05 = 100%
+ int raw_value = (b[5] << 8) | b[6];
+
+ // Left bit, 1 = High Sensitivity, 0 = Low Sensitivity, Right Bit: 1 = Alarm On, 0 = Alarm Off
+ // int settings = (b[7] >> 4);
+ int sensitivity = (b[7] >> 7) & 1;
+ int alarm = (b[7] >> 6) & 1;
+
+ /* clang-format off */
+ data_t *data = data_make(
+ "model", "", DATA_STRING, "Fineoffset-WH55",
+ "id", "ID", DATA_FORMAT, "%05X", DATA_INT, device_id,
+ "channel", "Channel", DATA_INT, channel,
+ "battery_ok", "Battery", DATA_DOUBLE, battery,
+ "raw_value", "Raw Value", DATA_INT, raw_value,
+ "sensitivity", "Sensitivity", DATA_INT, sensitivity,
+ "alarm", "Alarm", DATA_INT, alarm,
+ "mic", "Integrity", DATA_STRING, "CRC",
+ NULL);
+ /* clang-format on */
+
+ decoder_output_data(decoder, data);
+ return 1;
+}
+
+static char const *const output_fields[] = {
+ "model",
+ "id",
+ "channel",
+ "battery_ok",
+ "raw_value",
+ "sensitivity",
+ "alarm",
+ "mic",
+ NULL,
+};
+
+r_device const fineoffset_wh55 = {
+ .name = "Fine Offset / Ecowitt WH55 water leak sensor",
+ .modulation = FSK_PULSE_PCM,
+ .short_width = 60,
+ .long_width = 60,
+ .reset_limit = 2500,
+ .decode_fn = &fineoffset_wh55_decode,
+ .fields = output_fields,
+};