MQTT data for SHEMP3 Shelly Pro 3 EM

[thomluther]

This post is to document the MQTT binary data mapping for device SHEMP3 Shelly Pro 3 EM.

This is a 3rd party device for Solix and the MQTT messages do not return the 'pn' field in the head.

Device awake publish interval: ?? sec
Device standby publish interval: N/A (no standby?)
Device real time trigger publish: ?? sec

[thomluther]

0405

This is a standard parm info message send for Shelly Pro 3 EM data:

Received message on topic: dt/anker_power/SHEMP3/57xxxxxxxxxx20/param_info
{'head': {'version': '1.0.0.1', 'client_id': 'cloud', 'sess_id': '8bxxxxxxxxxxxxxxxxxxxxxxxxxxxxcc', 'cmd': 16, 'cmd_status': 2, 'msg_seq': 1, 'sign_code': 0, 'seed': '', 'timestamp': 1757623422}, 'payload': '{"data":"/wllAAMADwQFoQE0oxxxxxxxxxx0OTMyNjA1MjCjAgEApAIBAKUCAQCmAwIAAKcDAgAAqAUDszQAAKkFAwAAAACqBQPNiFYDqwUDR0HSAKwFAwAAAACtBQMAAAAA/gUDYvDDaIg=","account_id":"784xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx78f","device_sn":"57xxxxxxxxxx20"}'}
2025-05-12 10:05:22 Device hex data:
ff:09:65:00:03:00:0f:04:05:a1:01:34:a2:0f:00:35:37:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:32:30:a3:02:01:00:a4:02:01:00:a5:02:01:00:a6:03:02:00:00:a7:03:02:00:00:a8:05:03:b3:34:00:00:a9:05:03:00:00:00:00:aa:05:03:cd:88:56:03:ab:05:03:47:41:d2:00:ac:05:03:00:00:00:00:ad:05:03:00:00:00:00:fe:05:03:62:f0:c3:68:88
------------ Smartmeter / SHEMP3 / 0405 / Header -------------
ff 09   : 2 Byte Anker Solix message marker (supposed 'ff 09')
65 00   : 2 Byte total message length (101) in Bytes (Little Endian format)
03 00 0f: 3 Byte fixed message pattern (supposed `03 00/01 0f` for send/receive)
04 05   : 2 Byte message type pattern (varies per device model and message type)
        : 1 Byte optional message increment (  0)
-- Fields --|- Value (Hex/Decode Options)---------------------------------------
Fld Len Typ        uIntLe/var          sIntLe         floatLe      dblLe/4int
a1   01  --    34
└->   1 unk                52              52                
a2   0f  00    35:37:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:32:30
└->  15 str   b'57xxxxxxxxxx20'                                 --> device_sn
a3   02  01    00
└->   2 ui                  0               0                
a4   02  01    00
└->   2 ui                  0               0                
a5   02  01    00
└->   2 ui                  0               0                
a6   03  02    00:00
└->   3 sile                0               0                             0;0
a7   03  02    00:00
└->   3 sile                0               0                             0;0
a8   05  03    b3:34:00:00
└->   5 var           13491;0           13491           0.000      179;52;0;0 --> grid_to_home_power (factor 0.01 in W)
a9   05  03    00:00:00:00
└->   5 var               0;0               0           0.000         0;0;0;0 --> ?
aa   05  03    cd:88:56:03
└->   5 var        -30515;854        56002765           0.000    205;136;86;3 --> grid_to_home_energy (factor 0.00001 in kWh)
ab   05  03    47:41:d2:00
└->   5 var         16711;210        13779271           0.000     71;65;210;0 --> photovoltaic_to_grid_energy (factor 0.00001 in kWh)
ac   05  03    00:00:00:00
└->   5 var               0;0               0           0.000         0;0;0;0
ad   05  03    00:00:00:00
└->   5 var               0;0               0           0.000         0;0;0;0 --> photovoltaic_to_grid_power? (factor 0.01 in W)
fe   05  03    62:f0:c3:68
└->   5 var       -3998;26819      1757671522 7402365955051894607970304.000  98;240;195;104 --> msg_timestamp (2025-09-12 10:05:22)
--------------------------------------------------------------------------------