====== New Packet Radio 3.0 ======

This page covers supporting information for users of New Packet Radio (NPR) 3.0 - the latest revision of the original F4HDK-invented New Packet Radio modem first released in 2019. 

===== NPR 3.0: Quick Start =====

By default, NPR 3.0 firmware is configured in Client mode, To establish a link, a Client and Master is required. Quick start setup for both is covered below.

All configuration is via the Ethernet port using **telnet**. Default configuration is **192.168.0.0/24**, the NPR IP is **192.168.0.253** and DHCP range starts at **192.168.0.65**

==== Initial Setup ====
  - Connect an antenna or dummy load
  - Power the device using 13.8V DC
  - Connect a DHCP enabled PC to the Ethernet port
  - Open a **terminal** and telnet to **192.168.0.253**

==== Client Setup ====
  - At the **ready>** prompt, type **display config**
  - Note the **modulation** and **frequency** settings, these must match the Master

==== Master Setup ====

When in Master mode, DHCP on the NPR Ethernet port is disabled. Follow these steps reconfigure NPR and require a local static IP is setup.

  - At the **ready>** prompt, type **display config**
  - Note the **modem_IP**, **netmask** and **IP_begin**
  - Type commands:
    * **set is_master yes**
    * **save**
    * **reboot**
  - On the connected PC or network, set a manual IP within the subnet and avoiding DHCP range starting with **IP_begin**, e.g. **192.168.0.20**
  - Validate connectivity by re-opening the telnet connection to **192.168.0.253**

==== Establishing and Validating and RF Connection ====
  - When in RF range, NPR should connect. The CONN light will be Green on the Client and TX and RX lights flashing
  - On the Server, see who is connected by running **who**
  - On the Client, see connected information by running **status**
  - Assuming the PC connected to the Master has an IP of 192.168.0.20 and PC connected to the Client has a DHCP assigned address of 192.168.0.65, both devices should be able to ping 

==== Additional Points to Note ====
  - <color #ed1c24>Be really careful if changing the IP configuration - set the config, check it, check it again, log it, then save and reboot</color>
  - Set your NIC MTU to 750 to achieve reliable and consistent performance
  - You always telnet to the modem_IP, which counter-intuitively does not have to be unique on the network. In the default configuration, you would use 192.168.0.253 on all modems when connecting via telnet

===== NPR 3.0: Upgrading Firmware =====

==== Prereqs ====

Flashing the firmware in NPR 3.0 requires:
  - A Windows PC
  - Installation of the {{ :packet:stm32_vcp_driver.zip |}} drivers
  - A Micro-USB cable
  - The new firmware (with .nfw extension)
  - The pynpr.exe program

==== Upgrade Process ====

  - Disconnect the power supply
  - Connect the Micro-USB Cable
  - Run the upgrade using either:
    * pynpr fwflash -s COM_PORT path/to/nfw.nfw
    * pynpr fwflash -s auto path/to/nfw.nfw

===== Original NPR - Background Material, Detailed Configuration Guides and Protocol Spec =====

[[https://hackaday.io/project/164092-npr-new-packet-radio|Original NPR Hackaday Page]]

[[https://hackaday.io/project/164092/files|Original NPR Source Files and Docs - Master]]

Unable to link to the Master docs using a URL - copied locally for ease of access

{{ :packet:npr70_introduction_en_v3.6.pdf |}}

{{ :packet:npr_advanced_guide_v2.16.pdf |}}

{{ :packet:npr_specification_v2.0.pdf |}}

===== NPR 3.0: Rear Pinouts =====
Connector 1
^  Pinout  ^  Description  ^
^ RX | RS232 RX, 921600 Baud |
^ TX | RS232 TX, 921600 Baud |
^ 12V0 | 12V Out|
^ 5V0 | 5V Out |
^ 3V3 | 3.3V Out |
^ - | Not Used |
^ GND | Ground |
^ PE1 | STM32 GPIO |
^ GND | Ground |
^ PE0 | STM32 GPIO |
^ PB7 | STM32 GPIO |
^ PD7 | STM32 GPIO |

Connector 2
^  Pinout  ^  Description  ^
^ 3V3 | 3.3V Out |
^ CLK | STM32 GPIO |
^ DIO | STM32 GPIO |
^ GND | Ground |
^ RST | STM32 GPIO |