add "print-json" command

Cargo.lock

@@ -302,6 +302,12 @@ dependencies = [
  "windows-sys",
 ]
 
+[[package]]
+name = "itoa"
+version = "1.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fad582f4b9e86b6caa621cabeb0963332d92eea04729ab12892c2533951e6440"
+
 [[package]]
 name = "kernel32-sys"
 version = "0.2.2"
@@ -423,6 +429,7 @@ dependencies = [
  "clap 4.0.29",
  "libmodbus-rs",
  "serde",
+ "serde_json",
 ]
 
 [[package]]
@@ -594,6 +601,12 @@ dependencies = [
  "windows-sys",
 ]
 
+[[package]]
+name = "ryu"
+version = "1.0.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7b4b9743ed687d4b4bcedf9ff5eaa7398495ae14e61cba0a295704edbc7decde"
+
 [[package]]
 name = "serde"
 version = "1.0.151"
@@ -614,6 +627,17 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "serde_json"
+version = "1.0.90"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8778cc0b528968fe72abec38b5db5a20a70d148116cd9325d2bc5f5180ca3faf"
+dependencies = [
+ "itoa",
+ "ryu",
+ "serde",
+]
+
 [[package]]
 name = "strsim"
 version = "0.8.0"

Cargo.toml

@@ -13,4 +13,5 @@ authors = ["Alex Janka <alex@alexjanka.com>"]
 libmodbus-rs = "0.8.3"
 clap = { version = "4.0", features = ["derive"] }
 bincode = "1.3"
-serde = { version = "1.0", features = ["derive"] }
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"

src/datatypes.rs

@@ -1,4 +1,5 @@
 use crate::INFO_SCALE;
+use serde::{Deserialize, Serialize};
 use std::fmt::{self, Debug};
 
 pub trait DataPoint {
@@ -22,7 +23,7 @@ impl fmt::Debug for dyn DataPoint {
     }
 }
 
-#[derive(Debug, Clone, Copy)]
+#[derive(Serialize, Deserialize, Debug, Clone, Copy)]
 pub struct Voltage {
     data: u16,
 }
@@ -59,7 +60,7 @@ impl DataPoint for Voltage {
     }
 }
 
-#[derive(Debug, Clone, Copy)]
+#[derive(Serialize, Deserialize, Debug, Clone, Copy)]
 pub struct Current {
     data: u16,
 }
@@ -96,7 +97,7 @@ impl DataPoint for Current {
     }
 }
 
-#[derive(Debug, Clone, Copy)]
+#[derive(Serialize, Deserialize, Debug, Clone, Copy)]
 pub struct VoltagePercentage {
     data: u16,
 }
@@ -131,7 +132,7 @@ impl DataPoint for VoltagePercentage {
     }
 }
 
-#[derive(Debug, Clone, Copy)]
+#[derive(Serialize, Deserialize, Debug, Clone, Copy)]
 pub struct Tempcomp {
     data: u16,
 }
@@ -168,7 +169,7 @@ impl DataPoint for Tempcomp {
     }
 }
 
-#[derive(Debug, Clone, Copy)]
+#[derive(Serialize, Deserialize, Debug, Clone, Copy)]
 pub struct Raw {
     data: u16,
 }

src/main.rs

@@ -4,7 +4,7 @@ mod datatypes;
 mod mppt_structs;
 mod offsets;
 use crate::datatypes::*;
-use crate::mppt_structs::{MpptEeprom, MpptRam};
+use crate::mppt_structs::{MpptData, MpptEeprom, MpptRam};
 use crate::offsets::{OffsetsEeprom, OffsetsRam};
 use clap::{Parser, Subcommand};
 use libmodbus_rs::{Modbus, ModbusClient, ModbusRTU};
@@ -58,6 +58,9 @@ enum Commands {
 
     /// Get all RAM values
     GetRam,
+
+    /// Print RAM and EEPROM values to JSON
+    PrintJSON,
 }
 
 #[derive(Debug, Clone)]
@@ -164,6 +167,16 @@ fn main() {
         Some(Commands::GetRam) => {
             println!("ram: {:#?}", ram_data);
         }
+        Some(Commands::PrintJSON) => {
+            println!(
+                "{}",
+                serde_json::to_string(&MpptData {
+                    ram: ram_data,
+                    eeprom: eeprom_data
+                })
+                .expect("Could not format data as JSON!")
+            );
+        }
         None => {
             println!("{eeprom_data}");
         }

src/mppt_structs.rs

@@ -1,7 +1,8 @@
 use crate::datatypes::*;
+use serde::{Deserialize, Serialize};
 use std::fmt::{self, Debug, Display};
 
-#[derive(Debug)]
+#[derive(Serialize, Deserialize, Debug)]
 pub struct MpptRam {
     // scaling values
     pub v_pu: f32,
@@ -140,7 +141,7 @@ impl MpptRam {
     }
 }
 
-#[derive(Debug)]
+#[derive(Serialize, Deserialize, Debug)]
 pub struct MpptEeprom {
     pub ev_absorp: Voltage,
     pub ev_float: Voltage,
@@ -266,3 +267,9 @@ eva_ref_fixed_pct_init: {}",
         )
     }
 }
+
+#[derive(Serialize, Deserialize)]
+pub struct MpptData {
+    pub ram: MpptRam,
+    pub eeprom: MpptEeprom,
+}