Meadow has a robust configuration framework that allows you to adjust settings at build-time and deploy them with an app.
OS/Device Configuration and Application Configuration
Meadow.OS support the following configuration sets:
- OS & Device Configuration - Specified in the
meadow.config.yaml
file. Includes general board and system configuration settings. - WiFi Network Credentials - Specified in the
wifi.config.yaml
. Specifies WiFi access point and password configuration. - Application Configuration - Specified in
app.config.yaml
. This functionality is coming soon.
These files are optional and the default values (shown below) will be used if the particular file is missing from the file system.
Must Set Copy to Output Directory
Build Action
In order to make sure these files are deployed to the device, they must be set to Copy to Output Directory
in the project.
Meadow.OS and Device Configuration (meadow.config.yaml
)
Includes OS and device level settings such as device name, default network behavior, and network settings.
Consider the following sample config file:
#===============================================================================
# main device config
Device:
# Name of the device on the network.
Name: MeadowF7V2_ConfigSample
#===============================================================================
# Control how the ESP coprocessor will start and operate.
Coprocessor:
# Should the ESP32 automatically attempt to connect to an access point at startup?
# If set to true, wifi.yaml credentials must be stored in the device.
AutomaticallyStartNetwork: true
# Should the ESP32 automatically reconnect to the configured access point?
AutomaticallyReconnect: true
# Maximum number of retry attempts for connections etc. before an error code is returned.
MaximumRetryCount: 7
# Network configuration.
Network:
# Automatically attempt to get the time at startup?
GetNetworkTimeAtStartup: true
# Time synchronization period in seconds.
NtpRefreshPeriod: 600
# Name of the NTP servers.
NtpServers:
- 0.pool.ntp.org
- 1.pool.ntp.org
- 2.pool.ntp.org
- 3.pool.ntp.org
# IP addresses of the DNS servers.
DnsServers:
- 1.1.1.1
- 8.8.8.8
The Device
section contains configurable properties for the system in general. The Coprocessor
section of the file determines how the coprocessor interacts with the STM32 and the network.
Device Name
This is the name that will show on the network.
Default value: MeadowF7
AutomaticallyStartNetwork
This parameter determines if the system will automatically attempt to connect to an access point as the board starts. This requires a default access point to be configured (see the description of the wifi.yaml
file below).
Valid values are:
false
- Do not connect (default)true
- Automatically connect if a default access point has been specified
AutomaticallyReconnect
This parameter determines if the system should automatically attempt to reconnect to an access point if there is a communication issue and the connection is dropped.
Valid values are:
false
- Do not reconnect (default)true
- Automatically try to reconnect
Reconnection attempts are limited by the MaximumRetryCount
parameter.
Note that this parameter does not force the system to start the network automatically, see AutomaticallyStartNetwork
for this functionality.
MaximumRetryCount
Ths property determines the maximum number of retry attempts for network operations should a failure occur.
Default value: 3
GetNetworkTimeAtStartup
Whether or not the Meadow should attempt to request the latest network time from an Network Time Protocol (NTP) server.
If set to true, NTP servers should be specified.
DnsServers
DNS server(s) to use for DNS queries.
wifi.config.yaml
The wifi.config.yaml
file can be used to set the default access point and the password for that access point. The wifi.yaml
file should look something like this:
Credentials:
Ssid: YourSSID
Password: SSIDPassword
This file will be processed after the meadow.config.yaml
file. The Ssid
name will be set as the default access point to be used as the system starts. The password will be used when connecting to the access point.
The wifi.config.yaml
file will be deleted from flash storage after it has been processed and stored in secure storage on the ESP32 as the information is considered sensitive. This prevents the possibility of the file being read at a later point in time.
The contents of this file along with the AutomaticallyStartNetwork
value in meadow.config.yaml
can be used to automatically connect to an access point when the board starts.
Sample Apps
For an example of configuration in use, see the Config Files sample App in the Meadow.Core.Samples
repo.
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Weather Station Using Public Web Service Using Meadow
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Build a WIFI Connected Clock Using Meadow
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Make a Meadow indoor/outdoor temperature/weather desk clock
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