implement sending messages

bot.ps1

@@ -0,0 +1,70 @@
+param (
+    [Parameter(Mandatory=$true)]
+    [string]
+    $HomeServer,
+
+    [Parameter(Mandatory=$true)]
+    [string]
+    $User,
+
+    [Parameter(Mandatory=$true)]
+    [securestring]
+    $AccessToken
+)
+
+function Send-MatrixEvent {
+    param (
+        [Parameter(Mandatory=$true)]
+        [string]
+        $RoomId,
+
+        [Parameter(Mandatory=$true)]
+        [string]
+        $Event,
+
+        [Parameter(Mandatory=$true)]
+        [string]
+        $EventType
+    )
+
+    #txn_id should be unique per client, so we use timestamp+random
+    $txn_id = '{0}{1}' -f (Get-Date -UFormat '%s'),(Get-Random)
+
+    $uri = '{0}/_matrix/client/r0/rooms/{1}/send/{2}/{3}' -f $HomeServer,$RoomId,$EventType,$txn_id
+
+    $header_splat = @{
+        Authentication = 'Bearer'
+        Token = $AccessToken
+        ContentType = 'application/json'
+    }
+    $http_splat = @{
+        Uri = $uri
+        Method = 'Put'
+        Body = $Event
+    }
+
+    $response = Invoke-RestMethod @header_splat @http_splat
+    if($response.event_id) {
+        Write-Output ('Event {0} sent to room {1}' -f $response.event_id,$RoomId)
+    }
+}
+function Send-MatrixNotice {
+    param (
+        [Parameter(Mandatory=$true)]
+        [string]
+        $RoomId,
+
+        [Parameter(Mandatory=$true)]
+        [string]
+        $Message
+    )
+
+    $event = @{
+        msgtype = 'm.notice'
+        body = $Message
+    } | ConvertTo-Json -Compress
+
+    Send-MatrixEvent -RoomId $RoomId -Event $event -EventType 'm.room.message'
+}
+
+Send-MatrixNotice -RoomId '!amKUIaaKdERatZsJgB:matrix.org' -Message ('asef :) {0}' -f (Get-Date))