Shelly Pro 3EM support for Venus OS 3.50+

Author: rkapsi

dbus-modbus-client.py

@@ -34,6 +34,7 @@
 import ev_charger
 import smappee
 import victron_em
+import shelly
 
 import logging
 log = logging.getLogger()

shelly.py

@@ -0,0 +1,72 @@
+import device
+import probe
+from register import *
+
+# Thys Python script adds support for Modbus enabled Shelly devices in dbus-modbus-client
+# version 1.58 and later.
+#
+# https://shelly-api-docs.shelly.cloud/gen2/ComponentsAndServices/Modbus
+#
+class Shelly_Meter(device.CustomName, device.EnergyMeter):
+    vendor_id = 'shelly'
+    vendor_name = 'Shelly'
+    min_timeout = 0.5
+
+    # Shelly uses input registers!
+    default_access = 'input'
+    
+    def device_init(self):
+        self.info_regs = [
+            Reg_text(0, 6, '/Serial', little=True),
+        ]
+
+        self.data_regs = [
+            Reg_f32l(1162, '/Ac/Energy/Forward', 1000, '%.1f kWh'),
+            Reg_f32l(1164, '/Ac/Energy/Reverse', 1000, '%.1f kWh'),
+            Reg_f32l(1013, '/Ac/Power', 1, '%.1f W'),
+
+            Reg_f32l(1020, '/Ac/L1/Voltage', 1, '%.1f V'),
+            Reg_f32l(1022, '/Ac/L1/Current', 1, '%.1f A'),
+
+        ]
+
+class Shelly_Pro_3EM(Shelly_Meter):
+    productname = 'Shelly Pro 3EM'
+    productmodel = 'SPEM-003CEBEU'
+    nr_phases = 3
+
+    # Shelly doesn't have a purely numerical Product ID and it's unclear what could 
+    # be a good placeholder for it. Using the Base16 encoded value of 'PEM3'.
+    productid = 0x50454D33
+
+    def device_init(self):
+        super().device_init()
+
+        self.data_regs += [
+            Reg_f32l(1182, '/Ac/L1/Energy/Forward', 1000, '%.1f kWh'),
+            Reg_f32l(1184, '/Ac/L1/Energy/Reverse', 1000, '%.1f kWh'),
+            Reg_f32l(1024, '/Ac/L1/Power', 1, '%.1f W'),
+
+            Reg_f32l(1040, '/Ac/L2/Voltage', 1, '%.1f V'),
+            Reg_f32l(1042, '/Ac/L2/Current', 1, '%.1f A'),
+            Reg_f32l(1202, '/Ac/L2/Energy/Forward', 1000, '%.1f kWh'),
+            Reg_f32l(1204, '/Ac/L2/Energy/Reverse', 1000, '%.1f kWh'),
+            Reg_f32l(1044, '/Ac/L2/Power', 1, '%.1f W'),
+
+            Reg_f32l(1060, '/Ac/L3/Voltage', 1, '%.1f V'),
+            Reg_f32l(1062, '/Ac/L3/Current', 1, '%.1f A'),
+            Reg_f32l(1222, '/Ac/L3/Energy/Forward', 1000, '%.1f kWh'),
+            Reg_f32l(1224, '/Ac/L3/Energy/Reverse', 1000, '%.1f kWh'),
+            Reg_f32l(1064, '/Ac/L3/Power', 1, '%.1f W'),
+        ]
+
+models = {
+    Shelly_Pro_3EM.productmodel: {
+        'model':    Shelly_Pro_3EM.productmodel,
+        'handler':  Shelly_Pro_3EM,
+    },
+}
+
+probe.add_handler(probe.ModelRegister(Reg_text(6, 10, 'model', little=True), models,
+                                      methods=['tcp'],
+                                      units=[1]))