TLS

Modbus\TCP Security Example

Target Platforms:

• ESP8266 (CLient/Server)
• ESP32 (Client only)

Sample certificates

cert.cmd Script to recreate all the certificates in the catalog. Requires OpenSSL installed.

Good issue explanation to read

Client

bool connect(const char* host, uint16_t port, const char* client_cert = nullptr, const char* client_private_key = nullptr, const char* ca_cert = nullptr);
bool connectWithKnownKey(IPAddress ip, uint16_t port, const char* client_cert = nullptr, const char* client_private_key = nullptr, const char* key = nullptr);

• const char* host Host name to connect to
• uint16_t port Host port
• const char* client_cert Client's certificate
• const char* client_private_key Client's private key
• const char* ca_cert Certificate of CA. Can be omitted (or set NULL) to escape certificate chain verifying.
• IPAddress ip Host IP address to connect to
• const char* key Server's public key

All certificates must be in PEM format and can be stored in PROGMEM.

Server

void server(uint16_t port, const char* server_cert = nullptr, const char* server_private_key = nullptr, const char* ca_cert = nullptr);

• uint16_t port Port to bind to
• const char* server_cert Server certificate in PEM format.
• const char* server_private_key Server private key in PEM format.
• const char* ca_cert Certificate of CA.

All certificates must be in PEM format and can be stored in PROGMEM.

Modbus Library for Arduino

ModbusRTU, ModbusTCP and ModbusTCP Security

(c)2020 Alexander Emelianov

The code in this repo is licensed under the BSD New License. See LICENSE.txt for more info.