diff --git a/schema.json b/schema.json
index dd9b6b83ae..f5e5f74d65 100644
--- a/schema.json
+++ b/schema.json
@@ -972,6 +972,7 @@
               "radar",
               "rainfall",
               "rssi",
+              "sapflow",
               "smart valve",
               "snr",
               "so2",
diff --git a/vendor/decentlab/dl-isf-codec.yaml b/vendor/decentlab/dl-isf-codec.yaml
new file mode 100644
index 0000000000..9a821aa7e1
--- /dev/null
+++ b/vendor/decentlab/dl-isf-codec.yaml
@@ -0,0 +1,161 @@
+uplinkDecoder:
+  fileName: dl-isf.js
+  examples:
+    - description: Example 1
+      input:
+        fPort: 1
+        bytes:
+          [
+            0x02,
+            0x3d,
+            0x01,
+            0x00,
+            0x03,
+            0x0c,
+            0x29,
+            0x0b,
+            0xab,
+            0x0c,
+            0x3e,
+            0x79,
+            0x70,
+            0x7a,
+            0x1d,
+            0x78,
+            0x43,
+            0x79,
+            0x91,
+            0x49,
+            0x08,
+            0x45,
+            0x99,
+            0x7e,
+            0x4c,
+            0xac,
+            0xde,
+            0xaa,
+            0x6e,
+            0x00,
+            0x00,
+            0x00,
+            0x00,
+            0x45,
+            0x7e,
+            0x41,
+            0x5a,
+            0x0b,
+            0x59,
+          ]
+      output:
+        data:
+          alpha_inner:
+            displayName: Alpha (inner)
+            value: 0.00352
+          alpha_outer:
+            displayName: Alpha (outer)
+            value: -0.05184
+          battery_voltage:
+            displayName: Battery voltage
+            unit: V
+            value: 2.905
+          beta_inner:
+            displayName: Beta (inner)
+            value: -0.04128
+          beta_outer:
+            displayName: Beta (outer)
+            value: -0.14816
+          device_id: 15617
+          diagnostic:
+            displayName: Diagnostic
+            value: 0
+          heat_velocity_inner:
+            displayName: Heat velocity (inner)
+            unit: "cm\u22C5h\u207B\xB9"
+            value: 0.144
+          heat_velocity_outer:
+            displayName: Heat velocity (outer)
+            unit: "cm\u22C5h\u207B\xB9"
+            value: -2.208
+          max_voltage:
+            displayName: Max voltage
+            unit: V
+            value: 11.486
+          min_voltage:
+            displayName: Min voltage
+            unit: V
+            value: 10.862
+          protocol_version: 2
+          sap_flow:
+            displayName: Sap flow
+            unit: "l\u22C5h\u207B\xB9"
+            value: -0.192
+          temperature_outer:
+            displayName: Temperature (outer)
+            unit: "\xB0C"
+            value: -4.36
+          tmax_inner:
+            displayName: Tmax (inner)
+            unit: s
+            value: 35.634
+          tmax_outer:
+            displayName: Tmax (outer)
+            unit: s
+            value: 37.392
+          upstream_tmax_inner:
+            displayName: Upstream Tmax (inner)
+            unit: s
+            value: 33.46
+          upstream_tmax_outer:
+            displayName: Upstream Tmax (outer)
+            unit: s
+            value: 35.58
+    - description: Example 2
+      input:
+        fPort: 1
+        bytes: [0x02, 0x3d, 0x01, 0x00, 0x02, 0x0b, 0x59]
+      output:
+        data:
+          battery_voltage:
+            displayName: Battery voltage
+            unit: V
+            value: 2.905
+          device_id: 15617
+          protocol_version: 2
+
+downlinkEncoder:
+  fileName: dl-downlink-codec.js
+  examples:
+    - description: Set period 3600 seconds and save
+      input:
+        data:
+          command: set period + save
+          parameter: 3600
+      output:
+        bytes: [0, 2, 14, 16, 72, 164]
+        fPort: 1
+    - description: Set ADR off
+      input:
+        data:
+          command: set adr off
+      output:
+        bytes: [0, 7, 0, 0, 229, 177]
+        fPort: 1
+
+downlinkDecoder:
+  fileName: dl-downlink-codec.js
+  examples:
+    - description: Set period 600 seconds
+      input:
+        fPort: 1
+        bytes: [0x00, 0x01, 0x02, 0x58, 0x7E, 0x51]
+      output:
+        data:
+          command: set period
+          parameter: 600
+    - description: Reset
+      input:
+        fPort: 1
+        bytes: [0xFE, 0xFE, 0x00, 0x00, 0x3C, 0x50]
+      output:
+        data:
+          command: reset
diff --git a/vendor/decentlab/dl-isf.js b/vendor/decentlab/dl-isf.js
new file mode 100644
index 0000000000..b497876c6b
--- /dev/null
+++ b/vendor/decentlab/dl-isf.js
@@ -0,0 +1,131 @@
+
+/* https://www.decentlab.com/products/sapflow-sensor-for-lorawan */
+
+var decentlab_decoder = {
+  PROTOCOL_VERSION: 2,
+  SENSORS: [
+    {length: 16,
+     values: [{name: 'sap_flow',
+               displayName: 'Sap flow',
+               convert: function (x) { return (x[0] * 16 - 50000) / 1000; },
+               unit: 'l⋅h⁻¹'},
+              {name: 'heat_velocity_outer',
+               displayName: 'Heat velocity (outer)',
+               convert: function (x) { return (x[1] * 16 - 50000) / 1000; },
+               unit: 'cm⋅h⁻¹'},
+              {name: 'heat_velocity_inner',
+               displayName: 'Heat velocity (inner)',
+               convert: function (x) { return (x[2] * 16 - 50000) / 1000; },
+               unit: 'cm⋅h⁻¹'},
+              {name: 'alpha_outer',
+               displayName: 'Alpha (outer)',
+               convert: function (x) { return (x[3] * 32 - 1000000) / 100000; }},
+              {name: 'alpha_inner',
+               displayName: 'Alpha (inner)',
+               convert: function (x) { return (x[4] * 32 - 1000000) / 100000; }},
+              {name: 'beta_outer',
+               displayName: 'Beta (outer)',
+               convert: function (x) { return (x[5] * 32 - 1000000) / 100000; }},
+              {name: 'beta_inner',
+               displayName: 'Beta (inner)',
+               convert: function (x) { return (x[6] * 32 - 1000000) / 100000; }},
+              {name: 'tmax_outer',
+               displayName: 'Tmax (outer)',
+               convert: function (x) { return (x[7] * 2) / 1000; },
+               unit: 's'},
+              {name: 'tmax_inner',
+               displayName: 'Tmax (inner)',
+               convert: function (x) { return (x[8] * 2) / 1000; },
+               unit: 's'},
+              {name: 'temperature_outer',
+               displayName: 'Temperature (outer)',
+               convert: function (x) { return (x[9] - 32768) / 100; },
+               unit: '°C'},
+              {name: 'max_voltage',
+               displayName: 'Max voltage',
+               convert: function (x) { return (x[10] - 32768) / 1000; },
+               unit: 'V'},
+              {name: 'min_voltage',
+               displayName: 'Min voltage',
+               convert: function (x) { return (x[11] - 32768) / 1000; },
+               unit: 'V'},
+              {name: 'diagnostic',
+               displayName: 'Diagnostic',
+               convert: function (x) { return x[12] + x[13] * 65536; }},
+              {name: 'upstream_tmax_outer',
+               displayName: 'Upstream Tmax (outer)',
+               convert: function (x) { return (x[14] * 2) / 1000; },
+               unit: 's'},
+              {name: 'upstream_tmax_inner',
+               displayName: 'Upstream Tmax (inner)',
+               convert: function (x) { return (x[15] * 2) / 1000; },
+               unit: 's'}]},
+    {length: 1,
+     values: [{name: 'battery_voltage',
+               displayName: 'Battery voltage',
+               convert: function (x) { return x[0] / 1000; },
+               unit: 'V'}]}
+  ],
+
+  read_int: function (bytes, pos) {
+    return (bytes[pos] << 8) + bytes[pos + 1];
+  },
+
+  decode: function (msg) {
+    var bytes = msg;
+    var i, j;
+    if (typeof msg === 'string') {
+      bytes = [];
+      for (i = 0; i < msg.length; i += 2) {
+        bytes.push(parseInt(msg.substring(i, i + 2), 16));
+      }
+    }
+
+    var version = bytes[0];
+    if (version != this.PROTOCOL_VERSION) {
+      return {error: "protocol version " + version + " doesn't match v2"};
+    }
+
+    var deviceId = this.read_int(bytes, 1);
+    var flags = this.read_int(bytes, 3);
+    var result = {'protocol_version': version, 'device_id': deviceId};
+    // decode payload
+    var pos = 5;
+    for (i = 0; i < this.SENSORS.length; i++, flags >>= 1) {
+      if ((flags & 1) !== 1)
+        continue;
+
+      var sensor = this.SENSORS[i];
+      var x = [];
+      // convert data to 16-bit integer array
+      for (j = 0; j < sensor.length; j++) {
+        x.push(this.read_int(bytes, pos));
+        pos += 2;
+      }
+
+      // decode sensor values
+      for (j = 0; j < sensor.values.length; j++) {
+        var value = sensor.values[j];
+        if ('convert' in value) {
+          result[value.name] = {displayName: value.displayName,
+                                value: value.convert.bind(this)(x)};
+          if ('unit' in value)
+            result[value.name]['unit'] = value.unit;
+        }
+      }
+    }
+    return result;
+  }
+};
+
+function decodeUplink(input) {
+  var res = decentlab_decoder.decode(input.bytes);
+  if (res.error) {
+    return {
+      errors: [res.error],
+    };
+  }
+  return {
+    data: res,
+  };
+}
diff --git a/vendor/decentlab/dl-isf.png b/vendor/decentlab/dl-isf.png
new file mode 100644
index 0000000000..6a9f8c8183
Binary files /dev/null and b/vendor/decentlab/dl-isf.png differ
diff --git a/vendor/decentlab/dl-isf.yaml b/vendor/decentlab/dl-isf.yaml
new file mode 100644
index 0000000000..40d14c5f83
--- /dev/null
+++ b/vendor/decentlab/dl-isf.yaml
@@ -0,0 +1,87 @@
+name: DL-ISF
+description: The Decentlab DL-ISF is a sapflow sensor for LoRaWAN®. Suitable for applications such as plant physiology, plant water use, hydraulic redistribution, hydrology, and irrigation scheduling.
+
+hardwareVersions:
+  - version: '1'
+    numeric: 1
+
+firmwareVersions:
+  - version: 1.5.7
+    numeric: 157
+    hardwareVersions:
+      - '1'
+    profiles:
+      EU863-870:
+        id: profile-eu868
+        lorawanCertified: true
+        codec: dl-isf-codec
+      AS923:
+        id: profile-as923
+        lorawanCertified: false
+        codec: dl-isf-codec
+      US902-928:
+        id: profile-us915
+        lorawanCertified: true
+        codec: dl-isf-codec
+      AU915-928:
+        id: profile-au915
+        lorawanCertified: false
+        codec: dl-isf-codec
+
+sensors:
+  - sapflow
+
+dimensions:
+  length: 135
+  width: 81
+  height: 70
+
+weight: 400
+
+battery:
+  replaceable: true
+  type: 2 C alkaline
+
+operatingConditions:
+  temperature:
+    min: -20
+    max: 50
+  relativeHumidity:
+    min: 0
+    max: 1.0
+
+ipCode: IP67
+
+keyProvisioning:
+  - custom
+keySecurity: none
+
+productURL: https://www.decentlab.com/products/sapflow-sensor-for-lorawan
+photos:
+  main: dl-isf.png
+
+compliances:
+  safety:
+    - body: IEC
+      norm: EN
+      standard: 62368-1
+  radioEquipment:
+    - body: ETSI
+      norm: EN
+      standard: 301 489-1
+      version: 2.2.0
+    - body: ETSI
+      norm: EN
+      standard: 301 489-3
+      version: 2.1.1
+    - body: ETSI
+      norm: EN
+      standard: 300 220-1
+      version: 3.1.1
+    - body: ETSI
+      norm: EN
+      standard: 300 220-2
+      version: 3.1.1
+    - body: IEC
+      norm: EN
+      standard: 62479:2010
diff --git a/vendor/decentlab/index.yaml b/vendor/decentlab/index.yaml
index 9e549747d3..49cceb3b76 100644
--- a/vendor/decentlab/index.yaml
+++ b/vendor/decentlab/index.yaml
@@ -16,6 +16,7 @@ endDevices:
   - dl-ds18
   - dl-dws
   - dl-iam
+  - dl-isf
   - dl-itst
   - dl-kl66
   - dl-lid