modbus_close 3 libmodbus v3.1.2 libmodbus Manual modbus_close close a Modbus connection void modbus_close(modbus_t *ctx); The modbus_close() function shall close the connection established with the backend set in the context. There is no return value. modbus_t *ctx; ctx = modbus_new_tcp("127.0.0.1", 502); if (modbus_connect(ctx) == -1) { fprintf(stderr, "Connection failed: %s\n", modbus_strerror(errno)); modbus_free(ctx); return -1; } modbus_close(ctx); modbus_free(ctx); modbus_connect3 The libmodbus documentation was written by Stéphane Raimbault <stephane.raimbault@gmail.com>