Matterbridge seems to say it sends a Mattermost message to a Telegram channel, but it doesn't arrive.

[nikkilocke]

I have a Telegram private channel, set up like this:

I have created a bot, and joined it to the channel as admin with the following settings:

I have the following gateway:

[[gateway]]
name="NikTestChannel"
enable=true
 
        [[gateway.inout]]
        account="telegram.niktest"
        channel="-1001237906643"

        [[gateway.inout]]
        account="mattermost.uk-nonick"
        channel="nik-test-channel"

If I post a message to the Mattermost channel, it does not make it to the Telegram channel:

[5967] DEBUG mattermost:   [handleMatterClient:bridge/mattermost/handlers.go:91] map[string]interface {}{"channel_display_name":"Nik Test Channel", "channel_name":"nik-test-channel", "channel_type":"O", "post":"{\"id\":\"yjgbxttnxbd4pkrir9ha7nabqr\",\"create_at\":1617210486959,\"update_at\":1617210486959,\"edit_at\":0,\"delete_at\":0,\"is_pinned\":false,\"user_id\":\"i9ui365d9py5pbp3ytoa7jerbc\",\"channel_id\":\"bt7uthsrsibmpje3u6risxfiac\",\"root_id\":\"\",\"parent_id\":\"\",\"original_id\":\"\",\"message\":\"Test channel\",\"type\":\"\",\"props\":{},\"hashtags\":\"\",\"pending_post_id\":\"i9ui365d9py5pbp3ytoa7jerbc:1617210486787\",\"reply_count\":0,\"metadata\":{}}", "sender_name":"@nikkilocke", "team_id":"m8wjtck64jfo8yes5wphw4jpga"}
[5967] DEBUG mattermost:   [handleMatterClient:bridge/mattermost/handlers.go:103] == Receiving event &matterclient.Message{Raw:(*model.WebSocketEvent)(0xc000124180), Post:(*model.Post)(0xc000721680), Team:"uk", Channel:"nik-test-channel", Username:"nikkilocke", Text:"Test channel", Type:"", UserID:"i9ui365d9py5pbp3ytoa7jerbc"}
[5967] DEBUG mattermost:   [handleMatter:bridge/mattermost/handlers.go:83] <= Sending message from nikkilocke on mattermost.uk-nonick to gateway
[5967] DEBUG mattermost:   [handleMatter:bridge/mattermost/handlers.go:84] <= Message is &config.Message{Text:"Test channel", Channel:"nik-test-channel", Username:"nikkilocke", UserID:"i9ui365d9py5pbp3ytoa7jerbc", Avatar:"", Account:"mattermost.uk-nonick", Event:"", Protocol:"", Gateway:"", ParentID:"", Timestamp:time.Time{wall:0x0, ext:0, loc:(*time.Location)(nil)}, ID:"yjgbxttnxbd4pkrir9ha7nabqr", Extra:map[string][]interface {}{}}
[5967] DEBUG mattermost:   [handleMatterClient:bridge/mattermost/handlers.go:91] map[string]interface {}{"channel_display_name":"Nik Test Channel", "channel_name":"nik-test-channel", "channel_type":"O", "post":"{\"id\":\"yjgbxttnxbd4pkrir9ha7nabqr\",\"create_at\":1617210486959,\"update_at\":1617210486959,\"edit_at\":0,\"delete_at\":0,\"is_pinned\":false,\"user_id\":\"i9ui365d9py5pbp3ytoa7jerbc\",\"channel_id\":\"bt7uthsrsibmpje3u6risxfiac\",\"root_id\":\"\",\"parent_id\":\"\",\"original_id\":\"\",\"message\":\"Test channel\",\"type\":\"\",\"props\":{},\"hashtags\":\"\",\"pending_post_id\":\"i9ui365d9py5pbp3ytoa7jerbc:1617210486787\",\"reply_count\":0,\"metadata\":{}}", "sender_name":"@nikkilocke", "team_id":"m8wjtck64jfo8yes5wphw4jpga"}
[5967] DEBUG mattermost:   [handleMatterClient:bridge/mattermost/handlers.go:103] == Receiving event &matterclient.Message{Raw:(*model.WebSocketEvent)(0xc0005b8a20), Post:(*model.Post)(0xc0007217c0), Team:"uk", Channel:"nik-test-channel", Username:"nikkilocke", Text:"Test channel", Type:"", UserID:"i9ui365d9py5pbp3ytoa7jerbc"}
[5967] DEBUG mattermost:   [handleMatter:bridge/mattermost/handlers.go:83] <= Sending message from nikkilocke on mattermost.uk to gateway
[5967] DEBUG mattermost:   [handleMatter:bridge/mattermost/handlers.go:84] <= Message is &config.Message{Text:"Test channel", Channel:"nik-test-channel", Username:"nikkilocke", UserID:"i9ui365d9py5pbp3ytoa7jerbc", Avatar:"", Account:"mattermost.uk", Event:"", Protocol:"", Gateway:"", ParentID:"", Timestamp:time.Time{wall:0x0, ext:0, loc:(*time.Location)(nil)}, ID:"yjgbxttnxbd4pkrir9ha7nabqr", Extra:map[string][]interface {}{}}

Posting a similar message to a Mattermost channel gatewayed to a Telegream Group does get through:

[5940] DEBUG mattermost:   [handleMatterClient:bridge/mattermost/handlers.go:91] map[string]interface {}{"channel_display_name":"Nik Test Group", "channel_name":"nik-test-group", "channel_type":"O", "post":"{\"id\":\"ei9pe11u33819xqy8gggo89c9e\",\"create_at\":1617210459127,\"update_at\":1617210459127,\"edit_at\":0,\"delete_at\":0,\"is_pinned\":false,\"user_id\":\"i9ui365d9py5pbp3ytoa7jerbc\",\"channel_id\":\"h5pjgpwsxtrk9qxqhwapwkme3y\",\"root_id\":\"\",\"parent_id\":\"\",\"original_id\":\"\",\"message\":\"Test me\",\"type\":\"\",\"props\":{},\"hashtags\":\"\",\"pending_post_id\":\"i9ui365d9py5pbp3ytoa7jerbc:1617210458957\",\"reply_count\":0,\"metadata\":{}}", "sender_name":"@nikkilocke", "team_id":"m8wjtck64jfo8yes5wphw4jpga"}
[5940] DEBUG mattermost:   [handleMatterClient:bridge/mattermost/handlers.go:103] == Receiving event &matterclient.Message{Raw:(*model.WebSocketEvent)(0xc0001e9230), Post:(*model.Post)(0xc000720c80), Team:"uk", Channel:"nik-test-group", Username:"nikkilocke", Text:"Test me", Type:"", UserID:"i9ui365d9py5pbp3ytoa7jerbc"}
[5940] DEBUG mattermost:   [handleMatter:bridge/mattermost/handlers.go:83] <= Sending message from nikkilocke on mattermost.uk-nonick to gateway
[5940] DEBUG mattermost:   [handleMatter:bridge/mattermost/handlers.go:84] <= Message is &config.Message{Text:"Test me", Channel:"nik-test-group", Username:"nikkilocke", UserID:"i9ui365d9py5pbp3ytoa7jerbc", Avatar:"", Account:"mattermost.uk-nonick", Event:"", Protocol:"", Gateway:"", ParentID:"", Timestamp:time.Time{wall:0x0, ext:0, loc:(*time.Location)(nil)}, ID:"ei9pe11u33819xqy8gggo89c9e", Extra:map[string][]interface {}{}}
[5940] DEBUG mattermost:   [handleMatterClient:bridge/mattermost/handlers.go:91] map[string]interface {}{"channel_display_name":"Nik Test Group", "channel_name":"nik-test-group", "channel_type":"O", "post":"{\"id\":\"ei9pe11u33819xqy8gggo89c9e\",\"create_at\":1617210459127,\"update_at\":1617210459127,\"edit_at\":0,\"delete_at\":0,\"is_pinned\":false,\"user_id\":\"i9ui365d9py5pbp3ytoa7jerbc\",\"channel_id\":\"h5pjgpwsxtrk9qxqhwapwkme3y\",\"root_id\":\"\",\"parent_id\":\"\",\"original_id\":\"\",\"message\":\"Test me\",\"type\":\"\",\"props\":{},\"hashtags\":\"\",\"pending_post_id\":\"i9ui365d9py5pbp3ytoa7jerbc:1617210458957\",\"reply_count\":0,\"metadata\":{}}", "sender_name":"@nikkilocke", "team_id":"m8wjtck64jfo8yes5wphw4jpga"}
[5940] DEBUG mattermost:   [handleMatterClient:bridge/mattermost/handlers.go:103] == Receiving event &matterclient.Message{Raw:(*model.WebSocketEvent)(0xc0005d36e0), Post:(*model.Post)(0xc000720dc0), Team:"uk", Channel:"nik-test-group", Username:"nikkilocke", Text:"Test me", Type:"", UserID:"i9ui365d9py5pbp3ytoa7jerbc"}
[5940] DEBUG mattermost:   [handleMatter:bridge/mattermost/handlers.go:83] <= Sending message from nikkilocke on mattermost.uk to gateway
[5940] DEBUG mattermost:   [handleMatter:bridge/mattermost/handlers.go:84] <= Message is &config.Message{Text:"Test me", Channel:"nik-test-group", Username:"nikkilocke", UserID:"i9ui365d9py5pbp3ytoa7jerbc", Avatar:"", Account:"mattermost.uk", Event:"", Protocol:"", Gateway:"", ParentID:"", Timestamp:time.Time{wall:0x0, ext:0, loc:(*time.Location)(nil)}, ID:"ei9pe11u33819xqy8gggo89c9e", Extra:map[string][]interface {}{}}
[5940] DEBUG gateway:      [SendMessage:gateway/gateway.go:478] => Sending config.Message{Text:"Test me", Channel:"nik-test-group", Username:"nikkilocke", UserID:"i9ui365d9py5pbp3ytoa7jerbc", Avatar:"", Account:"mattermost.uk", Event:"", Protocol:"mattermost", Gateway:"NikTestGroup", ParentID:"", Timestamp:time.Time{wall:0xc01148f6cb49cf34, ext:5940084320677, loc:(*time.Location)(0x34b9240)}, ID:"ei9pe11u33819xqy8gggo89c9e", Extra:map[string][]interface {}{}} from mattermost.uk (nik-test-group) to telegram.niktest (-523826179)
[5940] DEBUG telegram:     [Send:bridge/telegram/telegram.go:73] => Receiving config.Message{Text:"Test me", Channel:"-523826179", Username:"(mattermost) &lt;nikkilocke&gt; ", UserID:"i9ui365d9py5pbp3ytoa7jerbc", Avatar:"", Account:"mattermost.uk", Event:"", Protocol:"mattermost", Gateway:"NikTestGroup", ParentID:"", Timestamp:time.Time{wall:0xc01148f6cb49cf34, ext:5940084320677, loc:(*time.Location)(0x34b9240)}, ID:"", Extra:map[string][]interface {}{}}
[5940] DEBUG telegram:     [sendMessage:bridge/telegram/telegram.go:148] Using mode HTML - nick only
[5940] DEBUG gateway:      [SendMessage:gateway/gateway.go:497] mID telegram.niktest: 21
[5940] DEBUG gateway:      [func1:gateway/gateway.go:487] => Send from mattermost.uk (nik-test-group) to telegram.niktest (-523826179) took 218.063322ms

[nikkilocke]

Apologies - my bad - I had corrected the matterbridge.toml file (I had put gateway.outout instead of [gateway.inout] against the mattermost gateway) - Matterbridge recognised that the config had changed, but posting to the channel didn't work.

I stopped Matterbridge, and restarted it, and it all sprang into life.