# Modbus Protocol version field is incorrect (Modbus version = 0)
alert modbus any any -> any any (msg:"SURICATA Modbus invalid Protocol version"; app-layer-event:modbus.invalid_protocol_id; classtype:protocol-command-decode; sid:2250001; rev:2;)
# Response (answer) we didn't see a Request for. Could be packet loss.
alert modbus any any -> any any (msg:"SURICATA Modbus unsolicited response"; app-layer-event:modbus.unsolicited_response; classtype:protocol-command-decode; sid:2250002; rev:2;)
# Malformed request or response. Malformed means length field is wrong
alert modbus any any -> any any (msg:"SURICATA Modbus invalid Length"; app-layer-event:modbus.invalid_length; classtype:protocol-command-decode; sid:2250003; rev:2;)
# Unit identifier field is incorrect
alert modbus any any -> any any (msg:"SURICATA Modbus invalid Unit Identifier"; app-layer-event:modbus.invalid_unit_identifier; classtype:protocol-command-decode; sid:2250004; rev:2;)
# Modbus Function code is incorrect
alert modbus any any -> any any (msg:"SURICATA Modbus invalid Function code"; app-layer-event:modbus.invalid_function_code; classtype:protocol-command-decode; sid:2250005; rev:2;)
# Modbus Request/Response value field is incorrect
alert modbus any any -> any any (msg:"SURICATA Modbus invalid Value"; app-layer-event:modbus.invalid_value; classtype:protocol-command-decode; sid:2250006; rev:2;)
# Modbus Exception code is incorrect
alert modbus any any -> any any (msg:"SURICATA Modbus Exception code invalid"; flow:to_client; app-layer-event:modbus.invalid_exception_code; classtype:protocol-command-decode; sid:2250007; rev:2;)
# Value field in Modbus Response does not match with Modbus Request
alert modbus any any -> any any (msg:"SURICATA Modbus Data mismatch"; flow:to_client; app-layer-event:modbus.value_mismatch; classtype:protocol-command-decode; sid:2250008; rev:2;)
# Request Flood Detected
alert modbus any any -> any any (msg:"SURICATA Modbus Request flood detected"; flow:to_server; app-layer-event:modbus.flooded; classtype:protocol-command-decode; sid:2250009; rev:2;)