MQTT support for wireless P1 modules

This file is a precompiled binary for using on my esp8266 wireless P1 modules.

After flashing, connect to the wireless network "esp_xxxxxx". It will pop-up an installation screen to configure your wireless network and mqtt server.

The topics that are available are:

sensors/power/p1meter/consumption_low_tarif 2209397
sensors/power/p1meter/consumption_high_tarif 1964962
sensors/power/p1meter/returndelivery_low_tarif 2209397
sensors/power/p1meter/returndelivery_high_tarif 1964962
sensors/power/p1meter/actual_consumption 313
sensors/power/p1meter/actual_returndelivery 0
sensors/power/p1meter/l1_instant_power_usage 313
sensors/power/p1meter/l2_instant_power_usage 0
sensors/power/p1meter/l3_instant_power_usage 0
sensors/power/p1meter/l1_instant_power_current 1000
sensors/power/p1meter/l2_instant_power_current 0
sensors/power/p1meter/l3_instant_power_current 0
sensors/power/p1meter/l1_voltage 233
sensors/power/p1meter/l2_voltage 0
sensors/power/p1meter/l3_voltage 0
sensors/power/p1meter/gas_meter_m3 968922
sensors/power/p1meter/actual_tarif_group 2
sensors/power/p1meter/short_power_outages 3
sensors/power/p1meter/long_power_outages 1
sensors/power/p1meter/short_power_drops 0
sensors/power/p1meter/short_power_peaks 0

The full source is viewable at my GitHub page