+ command queue
+ feedback from inverter for actual power limit via InfoCmd -> SystemConfigPara (0x05)
+ REST API will enqueue a new info command
+ change in power limit will enqueue infocm to get actual power limit
+ actual power limit is available under mqtt topic <TOPIC>/<NAME>/ch0/PowerLimit ALWAYS in percent
+ Firmware information will be requested automatically up on start of dtu
* fixed behavior if no MQTT IP is set (the system was nearly unusable because of delayed responses)
* fixed Station / AP WiFi on startup -> more information will be printed to the serial console
* added new ticker for serial value dump
* added option to compile WiFi SSID + PWD to firmware
* added option to configure WiFi access point name and password
* added feature to retry connect to station WiFi (configurable timeouts)
* updated index.html
* added option for factory reset
* added info about project on index.html
* moved "update" and "home" to footer
* fixed#23 HM1200 yield day unit
* fixed DNS name of ESP after setup (some commits before)
* build CRC over settings, only if the CRC matches settings are applied
* send command 0x80 (set time was wrong)
* improved crc16 routine
* added statistics for received commands and send statistics (channels are not correct for now!)
* receive of commands 0x01, 0x02, 0x03, 0x81 and 0x84 working