update hostname and MQTT broker

lib/IP5306/IP5306.cpp

@@ -0,0 +1,50 @@
+/*
+  IP5306.cpp - Library for IP5306_I2C Power controller.
+  Created by Sebastian Haap, December 3, 2019.
+  Based on https://gist.github.com/me-no-dev/7702f08dd578de5efa47caf322250b57
+*/
+
+#include "Wire.h"
+#include "IP5306.h"
+
+int ip5306_get_reg(uint8_t reg){
+    Wire.beginTransmission(0x75);
+    Wire.write(reg);
+    if(Wire.endTransmission(false) == 0 && Wire.requestFrom(0x75, 1)){
+        return Wire.read();
+    }
+    return -1;
+}
+
+int ip5306_set_reg(uint8_t reg, uint8_t value){
+    Wire.beginTransmission(0x75);
+    Wire.write(reg);
+    Wire.write(value);
+    if(Wire.endTransmission(true) == 0){
+        return 0;
+    }
+    return -1;
+}
+
+uint8_t ip5306_get_bits(uint8_t reg, uint8_t index, uint8_t bits){
+    int value = ip5306_get_reg(reg);
+    if(value < 0){
+        //Serial.printf("ip5306_get_bits fail: 0x%02x\n", reg);
+        return 0;
+    }
+    return (value >> index) & ((1 << bits)-1);
+}
+
+void ip5306_set_bits(uint8_t reg, uint8_t index, uint8_t bits, uint8_t value){
+    uint8_t mask = (1 << bits) - 1;
+    int v = ip5306_get_reg(reg);
+    if(v < 0){
+        //Serial.printf("ip5306_get_reg fail: 0x%02x\n", reg);
+        return;
+    }
+    v &= ~(mask << index);
+    v |= ((value & mask) << index);
+    if(ip5306_set_reg(reg, v)){
+        //Serial.printf("ip5306_set_bits fail: 0x%02x\n", reg);
+    }
+}