Feat: Add scripts for MPD channels

Channel/ChannelReadMessages.lua

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+-- {"order":1,"arguments":[]}
+
+local rc, result =  mympd.api("MYMPD_API_CHANNEL_MESSAGES_READ", {})
+
+if rc == 1 or result.totalEntities == 0 then
+    return
+end
+
+local messages = ""
+for _, msg in pairs(result.data) do
+    messages = messages .. msg.channel .. ": " .. msg.message
+end
+
+return messages

Channel/ChannelSendMessage.lua

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+-- {"order":1,"arguments":["channel", "message"]}
+
+local channel = mympd_arguments.channel
+if not channel or channel == "" then
+    channel = "myMPD"
+end
+
+local rc, result = mympd.api("MYMPD_API_CHANNEL_MESSAGE_SEND", {
+    channel = channel,
+    message = mympd_arguments.message
+})
+
+if rc == 1 then
+    return "Failure sending message: " .. result.data.msg
+end

Channel/ChannelSubscribe.lua

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+-- {"order":1,"arguments":["channel"]}
+
+local channel = mympd_arguments.channel
+if not channel or channel == "" then
+    channel = "myMPD"
+end
+
+local rc, result = mympd.api("MYMPD_API_CHANNEL_SUBSCRIBE", {
+    channel = channel
+})
+
+if rc == 1 then
+    return "Failure subscribing to the channel: " .. result.data.msg
+end

Channel/README.md

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+# Channel
+
+Scripts for MPD channels.
+
+| SCRIPT | DESCRIPTION |
+| ------ | ----------- |
+| `ChannelSubscribe.lua` | Subscribes to a channel. Connect it to the `mympd_connected` event to subscribe myMPD to a channel. |
+| `ChannelReadMessages.lua` | Reads all messages from a channel. Connect it to the `mpd_message` to receive messages. |
+| `ChannelSendMessage.lua` | Sends a message to a channel. |