To build and flash for KMP type meter (Multical 601):

KEY=ef500c9268cf749016d26d6cbfaaf7bf AP=1 make clean all flashall

To build and flash for en61107, sub type Multical 66 C:

EN61107=1 KEY=ef500c9268cf749016d26d6cbfaaf7bf AP=1 make clean all flashall

To build and flash for en61107, sub type Multical 66 B:

MC_66B=1 KEY=ef500c9268cf749016d26d6cbfaaf7bf AP=1 make clean all flashall

To build and flash for impulse based electricity meter:

IMPULSE=1 KEY=ef500c9268cf749016d26d6cbfaaf7bf AP=1 make clean all flashall

To configure wireless network:

SERIAL=9999999 KEY=ef500c9268cf749016d26d6cbfaaf7bf make wifisetup

BUILD OPTIONS DEBUG=1 enable serial debugging

DEBUG_NO_METER=1 dont wait for meter to answer

DEBUG_SHORT_WEB_CONFIG_TIME=1 dont wait for web config

IMPULSE=1 meter type is impulse based (100 mS)

EN61107=0 meter type is KMP (Multical 601)

EN61107=1 meter type is en61107, sub type Multical 66 C

MC_66B=1 meter type is en61107, sub type Multical 66 B

THERMO_NO=0 thermo actuator is normal closed

THERMO_NO=1 thermo actuator is normal open

THERMO_ON_AC_2 thermo actuator connected on ac 2

LED_ON_AC=1 use led to indicate ac state

SERIAL=9999999 serial number for meter used for device's SSID: IMPULSE meters EL_9999999 and other Kamstrup meters KAM_9999999. Used in make wifisetup target and if DEBUG_NO_METER=1

KEY=ef500c9268cf749016d26d6cbfaaf7bf master key for crypto, 16 bytes Fist 8 bytes hex encoded (ef500c9268cf7490) is wifi setup password. Master key is sha256 hashed to 32 bit and first first 16 bytes is aes key and last 16 bytes is hmac sha256 key.

Crypto is applies on mqtt packages like: first 32 bytes of mqtt_message contains hmac sha256, next 16 bytes contains IV last part is aes encrypted data

AP=1 enable wireless extender; wireless AP enables open source lwip and uses more memory so mqtt buffer is smaller when this option is set.

MQTT format for messages sent to meter

Topic	Message
/config/v2/9999999/[unix time]/ping
/config/v2/9999999/[unix time]/open	[unix time]
/config/v2/9999999/[unix time]/open_until	[kWh when meter should close]
/config/v2/9999999/[unix time]/open_until_delta	[[kWh when meter should close as delta]
/config/v2/9999999/[unix time]/close	[unix time]
/config/v2/9999999/[unix time]/status
/config/v2/9999999/[unix time]/set_cron	minute=30&hour=&day_of_month=&month=&day_of_week=&command=open
/config/v2/9999999/[unix time]/cron
/config/v2/9999999/[unix time]/clear_cron	[unix time]
/config/v2/9999999/[unix time]/ping
/config/v2/9999999/[unix time]/version
/config/v2/9999999/[unix time]/uptime
/config/v2/9999999/[unix time]/vdd
/config/v2/9999999/[unix time]/rssi
/config/v2/9999999/[unix time]/ssid
/config/v2/9999999/[unix time]/scan
/config/v2/9999999/[unix time]/set_ssid	[ssid]
/config/v2/9999999/[unix time]/set_pwd	[pwd]
/config/v2/9999999/[unix time]/wifi_status
/config/v2/9999999/[unix time]/start_ap	[start ap + save to flash if changed]
/config/v2/9999999/[unix time]/stop_ap	[stop ap + save to flash if changed]
/config/v2/9999999/[unix time]/ap_status
/config/v2/9999999/[unix time]/reconnect
/config/v2/9999999/[unix time]/save (only pulse meter)
/config/v2/9999999/[unix time]/mem
/config/v2/9999999/[unix time]/reset_reason

MQTT format for messages sent from meter

Topic	Message
/sample/v2/9999999/[unix time]	heap=20000&t1=25.00 C&t2=15.00 C&tdif=10.00 K&flow1=0 l/h&effect1=0.0 kW&hr=0 h&v1=0.00 m3&e1=0 kWh&
/cron/v2/9999999/[unix time]	12
/ping/v2/9999999/[unix time]
/version/v2/9999999/[unix time]	[sdk version]-[git version]