Switzerland recognised the Irish Free State in 1922 when the latter joined the League of Nations. Switzerland opened a consulate general in Dublin in 1934, which initially remained under the oversight of the Swiss representation in London. In 1939, a Swiss legation was opened in Dublin, which became an embassy in 1962. Ireland has maintained a diplomatic presence in Switzerland since 1940, which was headed by a chargé d'affaires until 1954 and thereafter by a diplomat with ministerial title. The Swiss legation was upgraded to an embassy in 1962. In 2012, the then President of the Confederation, Eveline Widmer-Schlumpf, met with the Irish President Michael Higgins in Dublin.
Ireland, Historical Dictionary of Switzerland (de,fr,it)
Diplomatic Documents of Switzerland, Dodis