add doc/mod/notification-telegram

(cherry picked from commit e6a686187c3d3c981b7ab86b4cbce46fc6466da4)

13 files changed, 80 insertions, 12 deletions

diff --git a/doc/backup-cloud.md b/doc/backup-cloud.md
index 4df14fd..c768be1 100644
--- a/doc/backup-cloud.md
+++ b/doc/backup-cloud.md
@@ -30,7 +30,8 @@ The configuration goes to `global-config-overlay`, these are the parameters:
 * `BackupPassword`: password to encrypt the backup with
 * `BackupRandomDelay`: delay up to amount of seconds when run from scheduler
 
-Also notification settings are required for e-mail, matrix and/or telegram.
+Also notification settings are required for e-mail, matrix and/or
+[telegram](mod/notification-telegram.md).
 
 Usage and invocation
 --------------------
diff --git a/doc/backup-upload.md b/doc/backup-upload.md
index 1e17d62..cbda74e 100644
--- a/doc/backup-upload.md
+++ b/doc/backup-upload.md
@@ -36,7 +36,8 @@ The configuration goes to `global-config-overlay`, these are the parameters:
 * `BackupUploadUser`: username for server authentication
 * `BackupUploadPass`: password for server authentication
 
-Also notification settings are required for e-mail, matrix and/or telegram.
+Also notification settings are required for e-mail, matrix and/or
+[telegram](mod/notification-telegram.md).
 
 ### Issues with SFTP client
 
diff --git a/doc/check-certificates.md b/doc/check-certificates.md
index f6a4d22..bddcd5a 100644
--- a/doc/check-certificates.md
+++ b/doc/check-certificates.md
@@ -27,7 +27,7 @@ Configuration
 -------------
 
 The expiry notifications just require notification settings for e-mail,
-matrix and/or telegram.
+matrix and/or [telegram](mod/notification-telegram.md).
 
 For automatic download and renewal of certificates you need configuration
 in `global-config-overlay`, these are the parameters:
diff --git a/doc/check-health.md b/doc/check-health.md
index 778c080..81a9f75 100644
--- a/doc/check-health.md
+++ b/doc/check-health.md
@@ -56,7 +56,8 @@ The configuration goes to `global-config-overlay`, these are the parameters:
 * `CheckHealthVoltageLow`: value (in volt*10) giving a hard lower limit
 * `CheckHealthVoltagePercent`: percentage value to trigger voltage jumps
 
-Also notification settings are required for e-mail, matrix and/or telegram.
+Also notification settings are required for e-mail, matrix and/or
+[telegram](mod/notification-telegram.md).
 
 ---
 [◀ Go back to main README](../README.md)  
diff --git a/doc/check-lte-firmware-upgrade.md b/doc/check-lte-firmware-upgrade.md
index a9da4a2..e5027a8 100644
--- a/doc/check-lte-firmware-upgrade.md
+++ b/doc/check-lte-firmware-upgrade.md
@@ -35,7 +35,8 @@ Just install the script:
 Configuration
 -------------
 
-Notification setting are required for e-mail, matrix and/or telegram.
+Notification setting are required for e-mail, matrix and/or
+[telegram](mod/notification-telegram.md).
 
 See also
 --------
diff --git a/doc/check-routeros-update.md b/doc/check-routeros-update.md
index da74639..b8f6183 100644
--- a/doc/check-routeros-update.md
+++ b/doc/check-routeros-update.md
@@ -47,7 +47,8 @@ safe versions from a web server. The configuration goes to
 * `SafeUpdateUrl`: url to check for safe update, the channel (`long-term`,
 `stable` or `testing`) is appended
 
-Also notification settings are required for e-mail, matrix and/or telegram.
+Also notification settings are required for e-mail, matrix and/or
+[telegram](mod/notification-telegram.md).
 
 Usage and invocation
 --------------------
diff --git a/doc/collect-wireless-mac.md b/doc/collect-wireless-mac.md
index 3120749..4e629a5 100644
--- a/doc/collect-wireless-mac.md
+++ b/doc/collect-wireless-mac.md
@@ -40,7 +40,8 @@ On first run a disabled access list entry acting as marker (with comment
 "`--- collected above ---`") is added. Move this entry to define where new
 entries are to be added.
 
-Also notification settings are required for e-mail, matrix and/or telegram.
+Also notification settings are required for e-mail, matrix and/or
+[telegram](mod/notification-telegram.md).
 
 Usage and invocation
 --------------------
diff --git a/doc/daily-psk.md b/doc/daily-psk.md
index 28baac0..0d6ddef 100644
--- a/doc/daily-psk.md
+++ b/doc/daily-psk.md
@@ -51,7 +51,8 @@ Then add an access list entry:
 
     / interface wireless access-list add comment="Daily PSK" interface=wl-daily private-pre-shared-key="ToBeChangedDaily";
 
-Also notification settings are required for e-mail, matrix and/or telegram.
+Also notification settings are required for e-mail, matrix and/or
+[telegram](mod/notification-telegram.md).
 
 ---
 [◀ Go back to main README](../README.md)  
diff --git a/doc/log-forward.md b/doc/log-forward.md
index 3a0f3be..6ff652f 100644
--- a/doc/log-forward.md
+++ b/doc/log-forward.md
@@ -46,7 +46,8 @@ The configuration goes to `global-config-overlay`, these are the parameters:
 * `LogForwardIncludeMessage`: define message text to be forwarded (even if
   filter matches)
 
-Also notification settings are required for e-mail, matrix and/or telegram.
+Also notification settings are required for e-mail, matrix and/or
+[telegram](mod/notification-telegram.md)m.
 
 ---
 [◀ Go back to main README](../README.md)  
diff --git a/doc/mod/notification-telegram.d/newbot.avif b/doc/mod/notification-telegram.d/newbot.avif
new file mode 100644
index 0000000..1fc7355
--- /dev/null
+++ b/doc/mod/notification-telegram.d/newbot.avif
diff --git a/doc/mod/notification-telegram.md b/doc/mod/notification-telegram.md
new file mode 100644
index 0000000..511d9a2
--- /dev/null
+++ b/doc/mod/notification-telegram.md
@@ -0,0 +1,58 @@
+Send notifications via Telegram
+===============================
+
+[◀ Go back to main README](../../README.md)
+
+> ℹ️️ **Info**: This module can not be used on its own but requires the base
+> installation. See [main README](../../README.md) for details.
+
+Description
+-----------
+
+This module adds support for sending notifications via
+[Telegram](https://telegram.org/) via bot api. A queue is used to make sure
+notifications are not lost on failure but sent later.
+
+Requirements and installation
+-----------------------------
+
+Just install the module:
+
+    $ScriptInstallUpdate mod/notification-telegram;
+
+Also install Telegram on at least one of your mobile and/or desktop devices
+and create an account.
+
+Configuration
+-------------
+
+Open Telegram, then start a chat with [BotFather](https://t.me/BotFather) and
+create your own bot:
+
+![create new bot](notification-telegram.d/newbot.avif)
+
+Now open a chat with your bot and start it by clicking the `START` button.
+
+Open just another chat with [GetIDs Bot](https://t.me/getidsbot), again start
+with the `START` button. It will send you some information, including the
+`id`, just below `You`.
+
+Finally edit `global-config-overlay`, add `TelegramTokenId` with the token
+from *BotFather* and `TelegramChatId` with your id from *GetIDs Bot*. Then
+reload the configuration.
+
+### Notifications to a group
+
+Sending notifications to a group is possible as well. Add your bot and the
+*GetIDs Bot* to a group, then use the group's id (which starts with a dash)
+for `TelegramChatId`. Then remove *GetIDs Bot* from group.
+
+Usage and invocation
+--------------------
+
+There's nothing special to do. Every script or function sending a notification
+will now send it to your Telegram account.
+
+---
+[◀ Go back to main README](../../README.md)  
+[▲ Go back to top](#top)
diff --git a/doc/netwatch-notify.md b/doc/netwatch-notify.md
index c9917cb..47fa5f3 100644
--- a/doc/netwatch-notify.md
+++ b/doc/netwatch-notify.md
@@ -88,7 +88,8 @@ powered off, but accessibility is of interest.
 
 Go and get your coffee ☕️ before sending the print job.
 
-Also notification settings are required for e-mail, matrix and/or telegram.
+Also notification settings are required for e-mail, matrix and/or
+[telegram](mod/notification-telegram.md).
 
 Tips & Tricks
 -------------
diff --git a/doc/sms-forward.md b/doc/sms-forward.md
index 417f462..9028045 100644
--- a/doc/sms-forward.md
+++ b/doc/sms-forward.md
@@ -31,8 +31,9 @@ Just install the script:
 Configuration
 -------------
 
-Notification settings are required for e-mail, matrix and/or telegram. Also
-you have to enable receiving of SMS:
+Notification settings are required for e-mail, matrix and/or
+[telegram](mod/notification-telegram.md). Also you have to enable receiving
+of SMS:
 
     / tool sms set receive-enabled=yes;