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--- doc:appunti:hardware:raspberrypi_nas [2021/03/20 17:02] – [Home Mediacenter and NAS with the Raspberry Pi] niccolo
+++ doc:appunti:hardware:raspberrypi_nas [2021/04/02 15:47] (current) – [Home Mediacenter and NAS with the Raspberry Pi] niccolo
@@ Line 1: / Line 1: @@
 ====== Home Mediacenter and NAS with the Raspberry Pi ======
-This is my recipe to build a mediacenter and NAS box using the Raspberry Pi. This is the list of hardware components:
+This is my recipe to build a **[[wp>Home_theater_PC|mediacenter]]** and **[[wp>Network-attached_storage|NAS]]** box using the **[[wp>Raspberry_Pi|Raspberry Pi]]**. This is the list of hardware components:
-  * Raspberry Pi 4.
+  * **Raspberry Pi 4** Model B with 4 Gb RAM.
-  * Seagate IronWolf 3.5 inch Hard disk, 4 Tb.
+  * 4 Tb **hard disk** Seagate IronWolf 3.5 inches.
-  * Suptronics.com X835 exapnsion board to connect SATA drives.
+  * **Suptronics.com X835** USB to SATA adapter, to connect the hard disk.
-  * USB audio adapter Ugreen.
+  * Ugreen **USB audio** adapter.
-  * SNES-like USB wireless gamepad used as remote control.
+  * **Gamepad** USB wireless (SNES-like) used as remote control.
 {{.:raspberrypi:rpi-nas-mediacenter.png?640|Raspberry Pi NAS and mediacenter}}
+{{.:raspberrypi:wifi-forbidden.png?90 |WiFi Warning}}
+**WARNING** :!: It turned out that the **Raspberry Pi 4**, when it uses the **USB 3** interface, produces **radio interferences on the 2.4 GHz** band. It is **impossibile to connect to the 2.4 GHz WiFi** access point which is only 5 meters far. It was also **impossible to use a wireless keyboard and mouse**, using one USB dongle which also operates on the 2.4 GHz. To operate a **wireless gamepad** (which also uses an USB dongle on the 2.4 GHz frequencies) I had to distantiate the dongle from the Raspberry Pi using and USB **extension cable of about 0.5 meters**. Due this **severe problem**, I can suggest the RPi4 solution only if you will use the **Ethernet** interface or an access point on the **5 Ghz** band. As an alternative to the wireless gamepad or keyboard, you can use the **[[https://play.google.com/store/apps/details?id=org.leetzone.android.yatsewidgetfree|Yatse application]]** on an Android smartphone.
+{{.:raspberrypi:forbidden-mpg4.png?90 |MPEG4 Warning}}
+**WARNING** :!: There is another potential problem with the **Raspberry Pi 4**: due the increased CPU power, the designers decided to drop the **H263** and **MPG4** codecs from the hardware. That codecs were enabled in-hardware into the older Raspberry Pi models and the license price was included into the hardware price. In older models you could also purchase additional licenses, e.g. for **MPEG2** and **VC-1**; this is no longer an option on the Raspberry Pi 4. I experience a **[[https://github.com/raspberrypi/linux/issues/4257|bug]]** with **Kodi** and **kernel 5.10**: software decoding of MPEG4 streams (e.g. the ones produced by the XviD library) were terribly jerky. I had to downgrade to **kernel 4.19** to solve the problem. Notice that the **LibreELEC 9.2** and **10.0 Beta** distributions play the same file smoothly.
 ====== Subsystems ======
@@ Line 21: / Line 26: @@
   * **[[raspberrypi_nas_remote_control]]**
   * **[[raspberrypi_nas_case]]**
-===== Mail system =====
-I want a working **mail system** on the NAS, mainly because I want to eventually receive error messages from the various subsystems, think e.g. at the **smartd** daemon watching for S.M.A.R.T. hard drive errors...
-In the following examples **pimedianas** is the hostname of my Raspberry Pi Mediacenter NAS. I istalled the **postfix** package and configured it as **satellite system** using a **SMTP relay host**. The relevant settings in **/etc/postfix/main.cf** are:
-<file>
-myhostname = pimedianas
-mydestination = $myhostname, localhost.localdomain, localhost
-relayhost = mail.example.org:587
-default_transport = smtp
-relay_transport = smtp
-myorigin = $myhostname
-# Rewrite some sender addresses.
-sender_canonical_maps = hash:/etc/postfix/sender_canonical_maps
-# Relay host requires SASL authentication.
-smtp_sasl_auth_enable = yes
-smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
-smtp_sasl_mechanism_filter = plain, login
-smtp_sasl_security_options =
-smtp_tls_security_level = may
-</file>
-The content of **/etc/postfix/sender_canonical_maps** will force the **MAIL FROM** on locally generated mails:
-<file>
-root                       pimedianas@example.org
-root@pimedianas            pimedianas@example.org
-root@localhost             pimedianas@example.org
-root@localhost.localdomain pimedianas@example.org
-</file>
-Write the proper info about **localhost** in **/etc/hosts**:
-<file>
-.0.1.1  localhost.localdomain   localhost
-</file>
-Finally I had to put my **SMTP credentials** required by the relaying server into **/etc/postfix/sasl_passwd**:
-<file>
-mail.example.org pimedianas:MyVerySecretPwd
-</file>
-Last but not least, I redirected all the mail for root to my real email address in **/etc/aliases**:
-<file>
-root:   niccolo@example.org
-</file>
-Remember to compile all the files and restart the service:
-<code>
-postmap /etc/postfix/sasl_passwd
-postmap /etc/postfix/sender_canonical_maps
-newaliases
-systemctl restart postfix.service
-</code>
-Now all the locally generated mails addressed to **root**, **%%root@pimedianas%%**, **%%root@localhost%%** or **%%root@localhost.localdomain%%** should have the **MAIL FROM** rewritten as above and forwarded to the external mailbox.