+++ /dev/null
---- a/include/rtpmidid/iobytes.hpp
-+++ b/include/rtpmidid/iobytes.hpp
-@@ -330,7 +330,7 @@ public:
-
- template <>
- struct fmt::formatter<rtpmidid::io_bytes_reader> : formatter<std::string_view> {
-- auto format(const rtpmidid::io_bytes_reader &data, format_context &ctx) {
-+ auto format(const rtpmidid::io_bytes_reader &data, format_context &ctx) const {
- return formatter<std::string_view>::format(
- fmt::format("[io_bytes_reader {} to {}, at {}, {}B left]",
- (void *)data.start, (void *)data.end, (void *)data.position,
-@@ -340,7 +340,7 @@ struct fmt::formatter<rtpmidid::io_bytes
- };
- template <>
- struct fmt::formatter<rtpmidid::io_bytes_writer> : formatter<std::string_view> {
-- auto format(const rtpmidid::io_bytes_reader &data, format_context &ctx) {
-+ auto format(const rtpmidid::io_bytes_reader &data, format_context &ctx) const {
- return formatter<std::string_view>::format(
- fmt::format("[io_bytes_writer {} to {}, at {}, {}B left]",
- (void *)data.start, (void *)data.end, (void *)data.position,
---- a/include/rtpmidid/network.hpp
-+++ b/include/rtpmidid/network.hpp
-@@ -24,7 +24,7 @@
-
- template <>
- struct fmt::formatter<sockaddr_storage> : formatter<std::string_view> {
-- auto format(const sockaddr_storage &addr, format_context &ctx) {
-+ auto format(const sockaddr_storage &addr, format_context &ctx) const {
- // print ip address and port
- char name[INET6_ADDRSTRLEN];
- if (addr.ss_family == AF_INET) {
---- a/include/rtpmidid/rtpclient.hpp
-+++ b/include/rtpmidid/rtpclient.hpp
-@@ -99,7 +99,7 @@ template <>
- struct fmt::formatter<rtpmidid::rtpclient_t::endpoint_t>
- : formatter<std::string_view> {
- auto format(const rtpmidid::rtpclient_t::endpoint_t &data,
-- format_context &ctx) {
-+ format_context &ctx) const {
- return formatter<std::string_view>::format(
- fmt::format("[endpoint_t [{}]:{}]", data.hostname, data.port), ctx);
- }
-@@ -109,7 +109,7 @@ template <>
- struct fmt::formatter<std::vector<rtpmidid::rtpclient_t::endpoint_t>>
- : formatter<std::string_view> {
- auto format(const std::vector<rtpmidid::rtpclient_t::endpoint_t> &data,
-- format_context &ctx) {
-+ format_context &ctx) const {
- std::string result;
- for (auto &endpoint : data) {
- result +=
-@@ -123,7 +123,7 @@ template <>
- struct fmt::formatter<std::list<rtpmidid::rtpclient_t::endpoint_t>>
- : formatter<std::string_view> {
- auto format(const std::list<rtpmidid::rtpclient_t::endpoint_t> &data,
-- format_context &ctx) {
-+ format_context &ctx) const {
- std::string result = "[";
- for (auto &endpoint : data) {
- result += fmt::format("[endpoint_t [{}]:{}] ", endpoint.hostname,
---- a/include/rtpmidid/rtppeer.hpp
-+++ b/include/rtpmidid/rtppeer.hpp
-@@ -152,7 +152,7 @@ public:
- template <>
- struct fmt::formatter<rtpmidid::rtppeer_t::status_e>
- : formatter<std::string_view> {
-- auto format(rtpmidid::rtppeer_t::status_e c, format_context &ctx) {
-+ auto format(rtpmidid::rtppeer_t::status_e c, format_context &ctx) const {
- std::string_view name = "UNKNOWN";
- switch (c) {
- case rtpmidid::rtppeer_t::status_e::NOT_CONNECTED:
-@@ -175,7 +175,7 @@ struct fmt::formatter<rtpmidid::rtppeer_
- template <>
- struct fmt::formatter<rtpmidid::rtppeer_t::port_e>
- : formatter<std::string_view> {
-- auto format(rtpmidid::rtppeer_t::port_e c, format_context &ctx) {
-+ auto format(rtpmidid::rtppeer_t::port_e c, format_context &ctx) const {
- const char *name = "UNKNOWN"; // NOLINT
- switch (c) {
- case rtpmidid::rtppeer_t::port_e::MIDI_PORT:
-@@ -192,7 +192,7 @@ struct fmt::formatter<rtpmidid::rtppeer_
- template <>
- struct fmt::formatter<rtpmidid::rtppeer_t::disconnect_reason_e>
- : formatter<std::string_view> {
-- auto format(rtpmidid::rtppeer_t::disconnect_reason_e c, format_context &ctx) {
-+ auto format(rtpmidid::rtppeer_t::disconnect_reason_e c, format_context &ctx) const {
- const char *name = "UNKNOWN"; // NOLINT
- switch (c) {
- case rtpmidid::rtppeer_t::disconnect_reason_e::CANT_CONNECT:
---- a/lib/mdns_rtpmidi.cpp
-+++ b/lib/mdns_rtpmidi.cpp
-@@ -52,12 +52,12 @@ struct AvahiEntryGroup {
- rtpmidid::mdns_rtpmidi_t *current = nullptr;
-
- template <> struct fmt::formatter<AvahiWatchEvent> : fmt::formatter<int> {
-- auto format(AvahiWatchEvent ev, fmt::format_context &ctx) {
-+ auto format(AvahiWatchEvent ev, fmt::format_context &ctx) const {
- return fmt::formatter<int>::format((int)ev, ctx);
- }
- };
- template <> struct fmt::formatter<AvahiBrowserEvent> : fmt::formatter<int> {
-- auto format(AvahiBrowserEvent ev, fmt::format_context &ctx) {
-+ auto format(AvahiBrowserEvent ev, fmt::format_context &ctx) const {
- return fmt::formatter<int>::format((int)ev, ctx);
- }
- };
---- a/src/aseq.hpp
-+++ b/src/aseq.hpp
-@@ -152,7 +152,7 @@ template <> struct hash<rtpmididns::aseq
- template <>
- struct fmt::formatter<rtpmididns::aseq_t::port_t>
- : formatter<std::string_view> {
-- auto format(rtpmididns::aseq_t::port_t c, format_context &ctx) {
-+ auto format(rtpmididns::aseq_t::port_t c, format_context &ctx) const {
- auto name = fmt::format("port_t[{}, {}]", c.client, c.port);
- return formatter<std::string_view>::format(name, ctx);
- }
---- a/src/mididata.hpp
-+++ b/src/mididata.hpp
-@@ -37,9 +37,9 @@ public:
-
- template <>
- struct fmt::formatter<rtpmididns::mididata_t> : formatter<std::string_view> {
-- auto format(const rtpmididns::mididata_t &data, format_context &ctx) {
-+ auto format(const rtpmididns::mididata_t &data, format_context &ctx) const {
-
- return fmt::format_to(ctx.out(), "[mididata_t {} + {}, at {}]",
- (void *)data.start, data.size(), data.pos());
- }
--};
-\ No newline at end of file
-+};
---- a/src/settings.hpp
-+++ b/src/settings.hpp
-@@ -58,7 +58,7 @@ template <>
- struct fmt::formatter<rtpmididns::settings_t::alsa_announce_t>
- : formatter<std::string_view> {
- auto format(const rtpmididns::settings_t::alsa_announce_t &data,
-- format_context &ctx) {
-+ format_context &ctx) const {
-
- return fmt::format_to(ctx.out(), "[alsa_announce_t {}]", data.name);
- }
-@@ -68,7 +68,7 @@ template <>
- struct fmt::formatter<std::vector<rtpmididns::settings_t::alsa_announce_t>>
- : formatter<std::string_view> {
- auto format(const std::vector<rtpmididns::settings_t::alsa_announce_t> &data,
-- format_context &ctx) {
-+ format_context &ctx) const {
- std::string result = "[";
- for (auto &item : data) {
- result += fmt::format("[{}] ", item.name);
-@@ -82,7 +82,7 @@ template <>
- struct fmt::formatter<rtpmididns::settings_t::rtpmidi_announce_t>
- : formatter<std::string_view> {
- auto format(const rtpmididns::settings_t::rtpmidi_announce_t &data,
-- format_context &ctx) {
-+ format_context &ctx) const {
-
- return fmt::format_to(ctx.out(), "[rtpmidi_announce_t {} {}]", data.name,
- data.port);
-@@ -94,7 +94,7 @@ struct fmt::formatter<std::vector<rtpmid
- : formatter<std::string_view> {
- auto
- format(const std::vector<rtpmididns::settings_t::rtpmidi_announce_t> &data,
-- format_context &ctx) {
-+ format_context &ctx) const {
- std::string result = "[";
- for (auto &item : data) {
- result +=
-@@ -109,7 +109,7 @@ template <>
- struct fmt::formatter<rtpmididns::settings_t::connect_to_t>
- : formatter<std::string_view> {
- auto format(const rtpmididns::settings_t::connect_to_t &data,
-- format_context &ctx) {
-+ format_context &ctx) const {
-
- return fmt::format_to(ctx.out(), "[connect_to_t {} {} {}]", data.hostname,
- data.port, data.name);
-@@ -120,7 +120,7 @@ template <>
- struct fmt::formatter<std::vector<rtpmididns::settings_t::connect_to_t>>
- : formatter<std::string_view> {
- auto format(const std::vector<rtpmididns::settings_t::connect_to_t> &data,
-- format_context &ctx) {
-+ format_context &ctx) const {
- std::string result = "[";
- for (auto &item : data) {
- result += fmt::format("[connect_to_t {} {} {}] ", item.hostname,
-@@ -133,7 +133,7 @@ struct fmt::formatter<std::vector<rtpmid
-
- template <>
- struct fmt::formatter<rtpmididns::settings_t> : formatter<std::string_view> {
-- auto format(const rtpmididns::settings_t &data, format_context &ctx) {
-+ auto format(const rtpmididns::settings_t &data, format_context &ctx) const {
-
- return fmt::format_to(ctx.out(),
- "[settings_t alsa_name: {} alsa_network: {} "